Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Foreign currency translation, Taxes	$ (19)	$ 39	$ (10)	$ (25)
Change in net unrealized losses on available-for-sale securities, Taxes	187	(198)	358	(75)
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, Taxes	(3)	15	(15)	5
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, Taxes	1	1	2	4
Change in net unrealized losses on cash flow hedges, Taxes	(72)	30	(117)	22
Change in unrealized losses on retirement plans, Taxes	$ 1	$ (3)	$ 3	$ 1