Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 2,037	$ 2,136	$ 2,061
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes of ($94), ($20) and $45, respectively	(889)	95	134
Net unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment and net of related taxes of ($269), ($521) and $469, respectively	437	(826)	798
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes of ($15), $56 and $17, respectively	(24)	86	27
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of $12, $11 and $13, respectively	18	18	21
Net unrealized gains (losses) on cash flow hedges, net of related taxes of $74, $62 and $52, respectively	115	92	74
Net unrealized gains (losses) on retirement plans, net of related taxes of ($50), $71 and ($36), respectively	(69)	80	(35)
Other comprehensive income (loss)	(412)	(455)	1,019
Total comprehensive income	$ 1,625	$ 1,681	$ 3,080