Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Foreign currency translation, net of related taxes of	$ (51)	$ (75)	$ (76)	$ (38)
Change in net unrealized losses on available-for-sale securities, net of reclassification adjustment and net of related taxes of	27	(94)	(48)	261
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, net of related taxes of	(10)	10	(5)	(5)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of	2	2	6	10
Change in net unrealized losses on cash flow hedges, net of related taxes of	17	37	39	34
Change in unrealized losses on retirement plans, net of related taxes of	$ 3	$ 3	$ 4	$ (2)