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Taxes - Effective Income Tax Reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income (loss) before income taxes      
United States $ 9,674,000,000 $ (5,700,000,000) $ (5,483,000,000)
International 11,965,000,000 (1,753,000,000) 11,019,000,000
Income (Loss) Before Income Tax Expense 21,639,000,000 (7,453,000,000) 5,536,000,000
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Theoretical tax (at U.S. statutory rate of 21% ) 4,544,000,000 (1,565,000,000) 1,163,000,000
Effect of U.S. tax reform 0 0 3,000,000
Equity affiliate accounting effect (890,000,000) 211,000,000 (687,000,000)
Effect of income taxes from international operations 2,692,000,000 (39,000,000) 2,196,000,000
State and local taxes on income, net of U.S. federal income tax benefit 216,000,000 (65,000,000) (18,000,000)
Prior year tax adjustments, claims and settlements 362,000,000 (236,000,000) 192,000,000
Tax credits (173,000,000) (33,000,000) (18,000,000)
Other U.S. (801,000,000) (165,000,000) (140,000,000)
Total income tax expense (benefit) $ 5,950,000,000 $ (1,892,000,000) $ 2,691,000,000
Effective income tax rate 27.50% 25.40% 48.60%
One-time tax costs (benefits) associated with changes in valuation allowances $ (624,000,000) $ 0 $ 0