Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Foreign currency translation, Taxes	$ (11)	$ (101)	$ (94)
Change in net unrealized losses on available-for-sale securities, Taxes	(119)	(195)	269
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, Taxes	16	5	(15)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, Taxes	5	8	12
Change in net unrealized losses on cash flow hedges, Taxes	(42)	24	74
Change in unrealized losses on retirement plans, Taxes	$ 1	$ 51	$ (50)