Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 1,958	$ 647	$ 189
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(1,343)	337	366
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(37)	37	120
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(60)	(241)	60
Other Comprehensive Income (Loss), Net of Tax	(1,440)	133	546
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 518	$ 780	$ 735