Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings/(losses) from continuing operations before income taxes:
United States									$ 751	$ (170)	$ 354
Outside United States									2,696	3,012	2,770
Earnings before income taxes									3,447	2,842	3,124
United States federal:
Current									145	(34)	1,322
Deferred									97	171	(1,274)
Federal income tax									242	137	48
State and local:
Current									29	23	32
Deferred									45	61	30
State and local taxes									74	84	62
Total United States									316	221	110
Outside United States:
Current									459	552	541
Deferred									(773)	0	15
Total outside United States									(314)	552	556
Total provision for income taxes	$ 230	$ (633)	$ 216	$ 189	$ 111	$ 310	$ 15	$ 337	$ 2	$ 773	$ 666