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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Examination [Line Items] |  |  |  |  |
Effective tax rate | 12.00% |  | 12.00% | 8.00% | 21.00%
Income (Loss) before income taxes | $ (512) |  | $ 3,493 | $ (2,054) | $ 8,238
Income Tax Expense (Benefit) | 62 |  | $ (422) | 171 | (1,724)
Reversal of deferred tax assets |  | $ (120) |  |  |
Refund from the Alberta Tax & Revenue Administration | 48 |  |  | 48 |
Decrease to our accrued income and other taxes liability |  | $ 124 |  |  |
Adjustment to valuation allowances | $ (33) |  |  | (264) |
Australia West Assets [Member] | Operating Segments [Member] | Asia Pacific [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  | 587 |
Income Tax Expense (Benefit) |  |  |  | 10 |
Reversal of deferred tax assets |  |  |  | $ 92 |
U.K. Subsidiaries [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | $ 262

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