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

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. This amount represent the portion of basis difference attributable to fair value changes of the investees.

No definition available.