Income Taxes Components of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal	$ 1,074	$ 677	$ 977
State and local	36	45	47
Foreign	497	444	528
Current	1,607	1,166	1,552
Deferred
Federal	(6)	4	(81)
State and local	(2)	(3)	(3)
Foreign	(12)	(17)	(6)
Deferred	(20)	(16)	(90)
Income tax expense	$ 1,587	$ 1,150	$ 1,462