Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Foreign currency translation, net of related taxes of	$ (101)	$ (94)	$ (20)
Change in net unrealized losses on available-for-sale securities, net of reclassification adjustment and net of related taxes of	(195)	(269)	(521)
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, net of related taxes of	5	(15)	56
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of	8	12	11
Change in net unrealized losses on cash flow hedges, net of related taxes of	24	74	62
Change in unrealized losses on retirement plans, net of related taxes of	$ 51	$ (50)	$ 71