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Income Taxes - Textuals (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 02, 2019
Income Tax Examination [Line Items] |  |  |  |  |  |
Deferred taxes Included in long-term liabilities | $ 4,634,000,000 |  | $ 4,634,000,000 | $ 5,021,000,000 |  |
Increase (decrease) in valuation allowance | 6,642,000,000 |  | 7,174,000,000 |  |  |
Deferred Tax Assets Net | 4,479,000,000 |  | 4,479,000,000 | 3,702,000,000 |  | $ 151,000,000
U.S. foreign tax credits | 7,696,000,000 |  | 7,696,000,000 |  |  | $ 6,642,000,000
Undistributed Earnings of Foreign Subsidiaries | 4,196,000,000 |  | 4,196,000,000 |  |  |
Estimated Tax Payable On Undistributed Unremitted Foreign Income |  |  | 210,000,000 |  |  |
Unrecognized tax benefits that if recognized, would affect effective tax rate | 1,100,000,000 |  | 1,100,000,000 | 1,081,000,000 | $ 882,000,000 |
Accrued liabilities for interest and penalties | 42,000,000 |  | 42,000,000 | 45,000,000 | 54,000,000 |
Interest and penalties (benefiting) charging earnings |  |  | 3,000,000 | 4,000,000 | 0 |
Tax Legislation |  |  | 0 | (10,000,000) | (852,000,000) |
Tax Cuts and Jobs Act, Decrease in Deferred Tax Liability due to Transition Tax |  |  | 10,000,000 | 908,000,000 |  |
One time tranisition tax |  |  |  | (10,000,000) | 56,000,000 |
Adjustment to valuation allowances |  |  | (225,000,000) | (26,000,000) | 0 |
Income Tax Expense (Benefit) |  |  | 2,267,000,000 | 3,668,000,000 | (1,822,000,000) |
Worthless Security Deduction |  |  | 9,000,000 | 36,000,000 | 962,000,000 |
Income Tax Loss (Benefit) related to U.K. disposition |  |  | (732,000,000) | (150,000,000) | 0 |
Malaysia Deepwater Tax Credits Incentive |  |  | 164,000,000 | 0 | 0 |
Capital Loss Carryforward | 202,000,000 |  | 202,000,000 |  |  |
Noncurrent Asset |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Deferred taxes Included in long-term assets | 184,000,000 |  | 184,000,000 | 442,000,000 |  |
Noncurrent Liabilities |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Deferred taxes Included in long-term liabilities | 4,634,000,000 |  | 4,634,000,000 | 5,021,000,000 |  |
Clair Field [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Gain (Loss) on Sale of Oil and Gas Property |  |  | 1,700,000,000 | $ 715,000,000 |  |
Income Tax Expense (Benefit) |  |  | (335,000,000) |  |  |
Income Tax Loss (Benefit) related to U.K. disposition |  |  | 285,000,000 |  |  |
Malaysia Deepwater Tax Credits Incentive |  | $ 164,000,000 |  |  |  |
Capital Loss Carryforward | $ 2,100,000,000 |  | $ 2,100,000,000 |  |  |
Foster Creek Christina Lake (FCCL) and western Canada gas properties [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  |  | 822,000,000 |
Tax impact of Canada disposition |  |  |  |  | (1,277,000,000) |
Income Tax Expense (Benefit) |  |  |  |  | $ (822,000,000) |

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