Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 620	$ 619	$ 1,122	$ 987
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes of ($110) and ($19), respectively	435	(213)	526	94
Net unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment and net of related taxes of $177 and $187, respectively	271	286	472	546
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes of zero and ($3), respectively	3	(3)	9	(22)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of zero and $1, respectively	1	2	2	3
Net unrealized gains (losses) on cash flow hedges, net of related taxes of ($113) and ($72), respectively	(177)	(106)	(247)	(174)
Net unrealized gains (losses) on retirement plans, net of related taxes of ($1) and $1, respectively	2	1	8	(2)
Other comprehensive income (loss)	535	(33)	770	445
Total comprehensive income	$ 1,155	$ 586	$ 1,892	$ 1,432