Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Foreign currency translation, net of related taxes of	$ 9	$ (64)
Change in net unrealized losses on available-for-sale securities, net of reclassification adjustment and net of related taxes of	171	123
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, net of related taxes of	(12)	(10)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of	1	3
Change in net unrealized losses on cash flow hedges, net of related taxes of	(45)	(8)
Change in unrealized losses on retirement plans, net of related taxes of	$ 2	$ 4