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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Consolidated Statements of Comprehensive Income        
Pension and postretirement income, associated tax $ 0 $ 0 $ 0 $ 0