Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 1,980	$ 2,022	$ 2,050
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes of ($101), ($94) and ($20), respectively	(735)	(889)	95
Net unrealized gains (losses) on available-for-sale securities, net of related taxes of ($195), ($269) and ($521), respectively	(331)	437	(826)
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes of $5, ($15) and $56, respectively	12	(24)	86
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of $8, $12 and $11, respectively	13	18	18
Net unrealized gains (losses) on cash flow hedges, net of related taxes of $24, $74 and $62, respectively	17	115	92
Net unrealized gains on retirement plans, net of related taxes of $51, ($50) and $71, respectively	89	(69)	80
Other comprehensive income (loss)	(935)	(412)	(455)
Total comprehensive income	$ 1,045	$ 1,610	$ 1,595