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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]        
Net income $ 388 $ 421 $ 802 $ 882
Pension and postretirement benefits other than pensions:        
Net loss arising during the period, net of income tax benefit of $3 for the nine-month period ended September 30, 2012. 0 0 (4) 0
Amortization of net loss included in net income, net of income tax expense of $1 for both the three months ended September 30, 2012 and 2011, and $4 and $2 for the nine months ended September 30, 2012 and 2011 respectively 1 1 5 3
Comprehensive income $ 389 $ 422 $ 803 $ 885