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Shareholders' Equity (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Stockholders' Equity Note [Abstract]    
Defined benefit and other postretirement liability adjustments $ (214) $ (214)
Cumulative translation adjustments (82) (82)
Other (55) (66)
Total accumulated other comprehensive loss $ (351) $ (362)