Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 674	$ 555	$ 1,591	$ 1,539
Other comprehensive income (loss), net of related taxes:
Foreign currency translation, net of related taxes of $26, $31, $60, and $(7), respectively	172	(462)	19	10
Change in net unrealized losses on available-for-sale securities, net of reclassification adjustment and net of related taxes of $326, $75, $471, and $318, respectively	543	91	794	449
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, net of related taxes of $(1), $(69), $9, and, $(63) respectively	(1)	(104)	14	(96)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of $4, $0, $6, and $8, respectively	7	0	10	13
Change in net unrealized losses on cash flow hedges, net of related taxes of $3, $1, $4, and $2, respectively	(5)	3	(1)	6
Change in minimum pension liability, net of related taxes of $(7), $0, $(6), and $23, respectively	7	(3)	9	(8)
Other comprehensive income (loss)	723	(475)	845	374
Total comprehensive income	$ 1,397	$ 80	$ 2,436	$ 1,913