Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Foreign currency translation, net of related taxes of	$ (64)	$ 8
Change in net unrealized losses on available-for-sale securities, net of reclassification adjustment and net of related taxes of	123	162
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, net of related taxes of	(10)	(6)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of	3	5
Change in net unrealized losses on cash flow hedges, net of related taxes of	(8)	(5)
Change in unrealized losses on retirement plans, net of related taxes of	$ 4	$ 3