Income Taxes - Pre-tax Income and Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Income before income taxes and equity income	$ 11,415	$ 7,421	$ 6,168
Current income tax expense
U.S. federal	20	84	42
U.S. state and local	142	272	102
Non-U.S.	395	493	758
Total current income tax expense	557	849	902
Deferred income tax expense (benefit)
U.S. federal	1,699	632	(145)
U.S. state and local	229	(15)	3
Non-U.S.	286	308	9
Total deferred income tax expense (benefit)	2,214	925	(133)
Total income tax expense	2,771	1,774	769
Basis differences from reinvested earnings	3,200	3,200
China JVs
Deferred income tax expense (benefit)
Additional basis differences	3,400	3,400
U.S.
Income Tax Contingency [Line Items]
Income before income taxes and equity income	9,513	6,881	3,826
Non-U.S.
Income Tax Contingency [Line Items]
Income before income taxes and equity income	$ 1,902	$ 540	$ 2,342