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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Statement of Income and Comprehensive Income [Abstract]    
Net income $ 201 $ 236
Pension and postretirement benefits other than pensions:    
Amortization of net loss included in net income, net of income tax expense of $3 and $1 for 2012 and 2011 respectively 3 1
Other comprehensive income 3 1
Comprehensive income $ 204 $ 237