Income Taxes Components of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal	$ 439	$ 642	$ 649
State and local	56	81	69
Foreign	781	897	871
Current	1,276	1,620	1,589
Deferred
Federal	106	40	(228)
State and local	9	0	(11)
Foreign	(42)	(47)	(5)
Deferred	73	(7)	(244)
Income tax expense	$ 1,349	$ 1,613	$ 1,345