| Dec 31, 2010 | 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 | 586 | 1,177 | 1,428 | -3,888 | -1,586 | 897 | -304 | -637 | -192 | -4,858 | -29 | 182 | 867 | 370 |
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| Deferred Income Tax Expense (Benefit) | 14 | 18 | 6 | -123 | -158 | 29 | 55 | 57 | 24 | -106 | -21 | 8 | -786 | 6 |
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| Depreciation | - | - | - | - | - | - | - | - | - | 541 | 66 | 91 | 101 | 122 |
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| Loss on extinguishment of debt | - | - | - | - | -33 | 288 | -3 | -19 | 194 | 3 | - | - | -29 | - |
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| Gain (Loss) on Disposition of Assets | - | - | - | - | - | - | - | - | - | - | 21 | 141 | 29 | -0 |
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| Amortization Of Debt Issuance Costs, Notes Receivable | - | - | - | - | - | - | - | - | - | - | -21 | 45 | 28 | 40 |
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| Share-based compensation expense | 45 | 53 | 50 | 45 | 40 | 40 | 41 | 42 | 37 | 21 | 4 | 17 | 27 | 28 |
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| EQUITY IN EARNINGS (LOSSES) OF ARO | - | - | - | - | - | - | - | - | -13 | -8 | 6 | 25 | 13 | -11 |
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| Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | - | - | - | - | - | - | - | - | - | - | -9 | -16 | -1 | -2 |
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| Loss on impairment | 12 | - | - | 4,219 | 2,746 | - | 183 | 40 | 104 | 3,646 | - | 35 | - | - |
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| Increase (Decrease) in Deferred Charges | - | - | - | - | - | - | - | - | - | - | - | - | 26 | -39 |
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| Increase (Decrease) in Contract with Customer, Liability | - | - | - | - | - | - | - | - | - | - | - | - | 5 | -32 |
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| Other | - | -6 | -15 | 16 | 18 | 3 | 26 | 4 | -17 | -7 | -0 | 2 | -7 | -9 |
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| Changes in operating assets and liabilities | - | - | 103 | -93 | 84 | 8 | -65 | 18 | 28 | 22 | -10 | -35 | -122 | 134 |
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| Contributions to pension plans and other post-retirement benefits | - | - | - | - | - | - | - | - | - | - | - | - | 7 | 22 |
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| Net cash provided by operating activities | - | - | - | - | - | - | - | - | - | -252 | -26 | 128 | 268 | 355 |
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| Additions to property and equipment | 875 | 1,802 | 1,779 | 1,569 | 1,620 | 322 | 537 | 427 | 227 | 94 | 50 | 207 | 696 | 455 |
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| Net proceeds from disposition of assets | 2 | - | 33 | 169 | 2 | 10 | 3 | 11 | 18 | 52 | 25 | 150 | 30 | 3 |
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| Purchases of short-term investments | - | - | - | - | - | - | - | - | - | - | - | 220 | - | - |
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| Maturities of short-term investments | - | - | 50 | 83 | 1,357 | 2,212 | 2,043 | 1,030 | 474 | - | - | 220 | - | - |
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| Repayment of note receivable from ARO | - | - | - | - | - | - | - | - | - | - | - | 40 | - | - |
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| Net Cash Provided by (Used in) Investing Activities, Total | -716 | -1,844 | - | - | - | - | - | - | - | -42 | -25 | -17 | -666 | -452 |
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| Proceeds from Issuance of Long-Term Debt | - | - | - | - | - | - | - | - | - | - | - | - | 1,103 | - |
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| Reduction of long-term borrowings | 17 | 48 | 48 | 60 | 1,073 | 864 | 537 | 771 | 928 | 10 | - | - | 572 | - |
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| Payments for Repurchase of Common Stock | 6 | - | - | - | - | - | - | - | - | - | - | - | 199 | 126 |
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| Payments of Debt Issuance Costs | - | - | 5 | 13 | 11 | 23 | 12 | 17 | - | - | - | - | 39 | 1 |
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| Payment, Tax Withholding, Share-Based Payment Arrangement | - | - | - | - | - | - | - | - | - | - | - | 3 | 5 | 30 |
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| Other | -11 | -17 | -22 | -30 | -16 | -7 | -8 | -6 | -10 | -2 | - | - | -3 | -1 |
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| Net cash provided by (used in) financing activities | -193 | -435 | -577 | 443 | -192 | 529 | -570 | 188 | -952 | 522 | - | -6 | 286 | -158 |
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| INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH | - | - | - | - | - | - | - | - | -178 | 229 | -51 | 104 | -113 | -255 |
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