Consolidated Statement of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	$ (223)	$ 80	$ (265)	$ 107
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect	(54)	(38)	(96)	(96)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	$ 3	$ (2)	$ 15	$ (16)