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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]    
Unrealized loss arising during period, tax $ (3)  
Reclassification adjustment for losses included in net earnings, tax 1 $ (1)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent [Abstract]    
Amortization of prior service cost included in net periodic pension cost, tax 6 10
Amortization of actuarial losses included in net periodic pension cost, tax (32) (60)
Pension and post retirement benefits related to our equity method investments, tax $ (2) $ 1