Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 2,061	$ 1,920	$ 1,556
Other comprehensive income, net of related taxes:
Foreign currency translation, net of related taxes of $45, $68 and $56, respectively	134	(216)	(65)
Change in net unrealized losses on available-for-sale securities, net of reclassification adjustment and net of related taxes of $469, $242 and $870, respectively	798	328	1,398
Change in net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes of $17, $(49) and $(17), respectively	27	(75)	(22)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of $13, $15 and $164, respectively	21	25	276
Change in net unrealized losses on cash flow hedges, net of related taxes of $52 for 2012 and $3 for 2011	74	6	7
Change in unrealized losses on retirement plans, net of related taxes of $(36), $(15) and $(11), respectively	(35)	(38)	(18)
Other comprehensive income	1,019	30	1,576
Total comprehensive income	$ 3,080	$ 1,950	$ 3,132