Consolidated Statement of Comprehensive Income/(Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income/(loss)	$ 250	$ 180
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	50	(69)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(101)	(125)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(24)	3
Other Comprehensive Income (Loss), Net of Tax	(75)	(191)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 175	$ (11)