Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 619	$ 418	$ 987	$ 823
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes of ($19), $39, ($10) and ($25), respectively	(213)	289	94	(410)
Net unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment and net of related taxes of $187, ($198), $358 and ($75), respectively	286	(337)	546	(143)
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes of ($3), $15, ($15) and $5, respectively	(3)	22	(22)	7
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of $1, $1, $2 and $4, respectively	2	3	3	7
Net unrealized gains (losses) on cash flow hedges, net of related taxes of $72, $30, ($117) and $22, respectively	(106)	8	(174)	20
Net unrealized gains (losses) on retirement plans, net of related taxes of $1, ($3), $3 and $1, respectively	1	10	(2)	15
Other comprehensive income (loss)	(33)	(5)	445	(504)
Total comprehensive income	$ 586	$ 413	$ 1,432	$ 319