Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 1,009	$ 854	$ 593
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent	211	(167)	52
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	(2,022)	(3,021)	(67)
Total Other Comprehensive Income (Loss), Net of Tax	(1,811)	(3,188)	(15)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (802)	$ (2,334)	$ 578