Consolidated Statement of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statement of Comprehensive Income [Abstract]
Change in net unrealized losses on available-for-sale securities, net of reclassification adjustment and net of related taxes of	$ 469	$ 242	$ 870
Change in net unrealized losses on available-for-sale securities designated in fair value hedges, net of related taxes of	17	(49)	(17)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes of	13	15	164
Foreign currency translation, net of related taxes of	45	68	56
Change in net unrealized losses on cash flow hedges, net of related taxes of	52	3	0
Change in minimum pension liability, net of related taxes of	$ (36)	$ (15)	$ (11)

- Definition

Tax effect, net of reclassification adjustments, of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

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