Consolidated Statement of Comprehensive Income/(Loss) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	$ (795)	$ 100	$ (688)	$ 170
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect	111	105	15	74
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	$ 3	$ 2	$ (13)	$ (7)