| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | 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) | 178 | 195 | 205 | 226 | - | - | - | 113 | 126 | -289 | -148 | 20 | 10 | 5 |
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| Depreciation and amortization | - | - | - | - | - | - | - | - | - | 125 | 111 | 97 | 87 | 85 |
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| Stock-based compensation expense (Note 13) | 17 | 30 | 49 | 63 | 72 | 85 | 96 | 118 | 124 | 109 | 120 | 88 | 96 | 120 |
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| Deferred Income Tax Expense (Benefit) | -1 | -5 | 5 | -17 | -37 | -20 | 29 | - | 6 | -1 | -44 | -19 | -25 | -14 |
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| Provision for expected credit losses (Note 2) | 1 | -1 | 1 | - | - | - | - | - | - | 17 | 3 | 6 | 6 | 8 |
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| Other, net | -0 | -0 | -2 | -11 | -9 | -10 | -10 | - | - | -11 | -19 | -7 | -9 | -9 |
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| Accounts receivable, prepaid expenses and other assets | - | - | - | - | - | - | - | - | -23 | -92 | 73 | 87 | -6 | 24 |
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| Accounts payable, accrued expenses and other liabilities | - | - | 23 | 18 | 13 | 7 | - | 22 | -1 | -28 | 30 | 72 | 11 | 13 |
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| Deferred merchant payables | - | - | - | - | - | - | - | - | - | -124 | 81 | 99 | 32 | 19 |
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| Income tax receivables/payables, net | - | - | - | - | - | 20 | 38 | 13 | 17 | -81 | 1 | 107 | -1 | -75 |
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| Deferred revenue | - | - | - | - | - | - | - | 5 | -2 | -34 | 8 | 10 | 4 | -2 |
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| Net cash provided by (used in) operating activities | 218 | 239 | 350 | - | - | - | - | 405 | 424 | -194 | 108 | 400 | 235 | 144 |
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| Capital expenditures, including capitalized website development | - | - | - | - | - | - | - | - | - | - | 54 | 56 | 63 | 74 |
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| Other investing activities, net | 0 | - | -0 | - | - | -2 | - | 12 | - | -3 | - | -4 | - | -1 |
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| Net cash provided by (used in) investing activities | -539 | -244 | -197 | - | - | - | - | -49 | -176 | -56 | -54 | -52 | -63 | -73 |
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| Repurchase of common stock (Note 14) | - | - | - | - | - | 105 | 250 | 100 | 60 | 115 | - | - | 100 | 25 |
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| Credit Facility | - | - | - | - | - | 101 | 433 | 5 | - | - | - | - | - | - |
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| Proceeds from debt, issuance costs | 397 | - | - | - | 287 | - | - | - | - | - | - | - | - | 493 |
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| Principal payments on Term Loan B Facility (Note 8) | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
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| Payment of 2025 Senior Notes (Note 8) | - | - | - | - | - | - | - | - | - | - | - | - | - | 500 |
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| Credit Facility | - | - | - | - | - | - | - | - | - | - | - | - | 3 | 1 |
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| Proceeds from Issuance or Sale of Equity | - | 231 | 24 | 3 | 12 | 7 | 3 | 6 | 2 | - | 8 | - | - | - |
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| Payment of withholding taxes on net share settlements of equity awards | - | 7 | 14 | 33 | 73 | 15 | 17 | 26 | 29 | 21 | 44 | 20 | 17 | 21 |
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| Payments of finance lease obligation and other financing activities, net (Note 5) | - | - | - | - | - | - | - | - | - | - | - | 7 | 7 | 8 |
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| Net cash provided by (used in) financing activities | 412 | 190 | -170 | - | - | - | - | -358 | -580 | 341 | 263 | -27 | -127 | -63 |
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| Effect of exchange rate changes on cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | -16 | -4 | 8 | -12 | -23 | 1 | -11 |
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| Net increase (decrease) in cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | -18 | -336 | 99 | 305 | 298 | 46 | -3 |
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| Income Taxes Paid, Net | 92 | 108 | 50 | 54 | 43 | 29 | 62 | 53 | 47 | 3 | 5 | -40 | 140 | 170 |
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| Cash paid during the period for interest | - | - | - | - | - | - | - | 8 | 6 | 13 | 43 | 40 | 39 | 58 |
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| Stock-based compensation capitalized website development costs | - | - | - | - | - | 12 | 13 | 13 | 19 | 15 | 13 | 10 | 10 | 13 |
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