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Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income/(loss) before tax $ (2,607) $ 2,238 $ 2,409
Net (income)/loss attributable to noncontrolling interests 1,872 (1,731) (1,773)
Income taxes attributable to noncontrolling interests 19 (66) (198)
Income/(loss) before tax after deducting net income and taxes attributable to noncontrolling interest $ (716) $ 441 $ 438
Federal statutory income tax rate 21.00% 21.00% 21.00%
Income tax expense/(benefit) at statutory rate $ (150) $ 93 $ 92
Deferred tax rate adjustment 11 10 3
State income tax, net of federal benefit (9) 7 9
Income taxes attributable to noncontrolling interests:      
Canadian federal and provincial income tax (19) 63 195
State income tax 0 3 3
Total income tax expense/(benefit) $ (167) $ 176 $ 302