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Income Taxes - Pre-tax Income and Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Income before income taxes and equity income | $ 7,421 | $ 6,168 | $ 6,386
Current income tax expense (benefit) |  |  |
U.S. federal | 84 | 42 | (104)
U.S. state and local | 272 | 102 | 113
Non-U.S. | 493 | 758 | 577
Total current income tax expense | 849 | 902 | 586
Deferred income tax expense (benefit) |  |  |
U.S. federal | 632 | (145) | (578)
U.S. state and local | (15) | 3 | 250
Non-U.S. | 308 | 9 | 216
Total deferred income tax expense (benefit) | 925 | (133) | (112)
Total income tax expense | 1,774 | 769 | 474
Basis differences from reinvested earnings | 3,200 | 3,200 |
China JVs |  |  |
Deferred income tax expense (benefit) |  |  |
Additional basis differences | 4,100 | 4,100 |
U.S. |  |  |
Income Tax Contingency [Line Items] |  |  |
Income before income taxes and equity income | 6,881 | 3,826 | 4,433
Non-U.S. |  |  |
Income Tax Contingency [Line Items] |  |  |
Income before income taxes and equity income | $ 540 | $ 2,342 | $ 1,953

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