| Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net Income (Loss) | 307 | -29 | 91 | 126 | 108 | 141 | -60 | 36 | 149 | -430 | 259 |
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| Net Income (Loss) Attributable to Noncontrolling Interest | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | 1 |
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| Depreciation and amortization | 202 | 229 | 224 | 190 | 185 | 195 | 146 | 145 | 151 | 161 | 152 |
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| Deferred tax (benefit) provision | -249 | -2 | -2 | -5 | -0 | 0 | -3 | -5 | 5 | -0 | -1 |
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| Stock-based compensation | 16 | 15 | 18 | 21 | 20 | 22 | 24 | 29 | 34 | 28 | 31 |
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| Provision for doubtful accounts | 3 | 3 | 4 | 4 | 2 | 5 | 20 | -4 | 5 | 6 | 6 |
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| Accretion expense | 2 | 3 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 |
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| Net (gain) loss on dispositions | 3 | -1 | 2 | 14 | 6 | 4 | 14 | 5 | -0 | 14 | 161 |
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| Impairment charges | - | - | - | - | - | - | - | - | - | 511 | - |
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| Loss on extinguishment of debt | - | - | - | - | - | -28 | - | -6 | - | -8 | -1 |
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| Equity in earnings of investee companies, net of tax | 3 | 5 | 5 | 5 | 4 | 6 | -1 | 1 | 3 | -1 | 1 |
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| Distributions from investee companies | 7 | 8 | 5 | 7 | 3 | 5 | 2 | 1 | 2 | 1 | 1 |
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| Amortization of Debt Issuance Costs | 12 | 6 | 6 | 6 | 6 | 8 | 7 | 7 | 7 | 7 | 6 |
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| Increase in receivables | 1 | 13 | 12 | 10 | 37 | 30 | -61 | 95 | 11 | 4 | 23 |
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| Increase in prepaid MTA equipment deployment costs | - | - | - | - | 75 | 92 | 33 | 75 | 83 | 22 | - |
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| (Increase) decrease in prepaid expenses and other current assets | 6 | 3 | 1 | 5 | 0 | -3 | 26 | -15 | -6 | 5 | -0 |
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| Increase (decrease) in accounts payable and accrued expenses | -6 | -26 | -44 | -32 | 22 | 36 | -13 | 39 | -0 | -4 | 14 |
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| Increase (decrease) in operating lease assets and liabilities | - | - | - | - | - | - | 11 | 0 | -15 | 11 | 10 |
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| Increase in deferred revenues | -10 | 3 | - | 1 | 9 | -1 | 1 | 1 | 5 | 4 | 5 |
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| Increase (decrease) in income taxes | -9 | 1 | 6 | 2 | -3 | 0 | 1 | -0 | 1 | -3 | 1 |
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| Decrease in assets and liabilities held for sale, net | - | - | - | - | - | - | - | - | - | - | 2 |
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| Other, net | 1 | 1 | 6 | 1 | 18 | -2 | -4 | 2 | -1 | 5 | 1 |
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| Net cash flow provided by operating activities | - | - | - | - | - | 277 | 131 | 99 | 254 | 254 | 299 |
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| Capital expenditures | 64 | 59 | 59 | 71 | 82 | 90 | 54 | 74 | 90 | 87 | 78 |
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| Acquisitions | 736 | 12 | 68 | 70 | 7 | 70 | 18 | 137 | 354 | 34 | 20 |
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| MTA franchise rights | - | - | - | - | 13 | 24 | 24 | 17 | 7 | -1 | 12 |
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| Proceeds from dispositions | 5 | 9 | 91 | 6 | 8 | 6 | 40 | 3 | 1 | 12 | 318 |
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| Investment in investee companies | - | - | - | - | - | - | - | - | 0 | - | 1 |
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| Return of investment in investee companies | - | - | - | - | 4 | 2 | 2 | - | - | - | 1 |
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| Net cash flow provided by (used for) investing activities | - | - | - | - | - | -176 | -53 | -224 | -449 | -107 | 208 |
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| Proceeds from long-term debt borrowings | 1,598 | - | - | 8 | 104 | 1,270 | 895 | 500 | - | 450 | - |
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| Repayments of long-term debt borrowings | - | 50 | 90 | - | 104 | 1,192 | 495 | 500 | - | 400 | 200 |
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| Proceeds from Lines of Credit | - | - | - | - | - | - | 15 | - | 30 | 120 | 145 |
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| Repayments of borrowings under short-term debt facilities | - | - | - | - | - | - | 130 | 80 | - | 85 | 200 |
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| Payments of deferred financing costs | 43 | 3 | 0 | 9 | 0 | 22 | 8 | 7 | 0 | 11 | 0 |
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| Payments of debt extinguishment charges | - | - | - | - | - | 21 | - | 5 | - | 6 | - |
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| Taxes withheld for stock-based compensation | - | 4 | 7 | 9 | 8 | 8 | 13 | 9 | 12 | 13 | 8 |
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| Purchase of redeemable noncontrolling interest | - | - | - | - | - | - | - | - | - | - | 24 |
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| Dividends | - | - | - | 202 | 204 | 208 | 75 | 58 | 206 | 207 | 208 |
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| Net cash flow used for financing activities | - | - | - | - | - | -94 | 573 | -162 | -188 | -151 | -495 |
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| Effect of exchange rate changes on cash, cash equivalents and restricted cash | - | - | - | - | - | 1 | 1 | 0 | -1 | 0 | -0 |
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| Net increase (decrease) in cash, cash equivalents and restricted cash | - | - | - | - | 6 | 7 | 651 | -287 | -384 | -4 | 11 |
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| Income Taxes Paid, Net | 53 | 6 | 1 | 7 | 8 | 11 | 3 | 2 | 3 | 7 | 12 |
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| Cash paid for interest | - | - | - | - | - | 122 | 128 | 118 | 126 | 151 | 152 |
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| Accrued purchases of property and equipment | 1 | 7 | 11 | 10 | 6 | 8 | 3 | 3 | 8 | 8 | 7 |
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| MTA franchise rights | - | - | - | - | 1 | 4 | 7 | 5 | 3 | 3 | 2 |
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