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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME    
Unrealized gains (losses) on derivatives, tax $ (3) $ 6
Pension and postretirement gains, tax (5) (3)
Reclassification to income of realized losses on derivatives, tax $ 1 $ (4)