Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 368	$ 405
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes of $9 and ($64), respectively	306	(699)
Net unrealized gains (losses) on available-for-sale securities, net of related taxes of $171 and $123, respectively	260	194
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes of ($12) and ($10), respectively	(19)	(15)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of $1 and $3, respectively	1	4
Net unrealized gains (losses) on cash flow hedges, net of related taxes of ($45) and ($8), respectively	(68)	12
Net unrealized gains (losses) on retirement plans, net of related taxes of $2 and $4, respectively	(2)	5
Other comprehensive income (loss)	478	(499)
Total comprehensive income	$ 846	$ (94)