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Basis of Presentation (Unaudited) (Details 4) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Prior Service Cost (Credit), after Tax $ 87   $ 98
Cumulative translation adjustment (143)   (144)
Other, net (3)   (6)
Total accumulated other comprehensive loss (59)   (52)
Unamortized prior service credit, tax expense 28   $ 32
Unamortized prior service credit, reclassified from accumulated other comprehensive loss to net earnings $ 11 $ 15