Consolidated Statements of Comprehensive Income (Parenthetical) (Parentheticals) (Tax Effect [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Tax Effect [Member]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Benefit Plan Improvement, Tax Effect	$ (1)	$ (5)	$ 3
Amounts Reclassified to Benefit Obligations Related to Consolidation of VIEs Tax Effect	0	0	5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	0	0	1
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax	0	0	1
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	1	0	(6)
Amounts Reclassified to Benefit Obligations Related to Consolidation of VIEs Tax Effect 1	0	0	(5)
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax	$ 0	$ 0	$ 0