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Shareholders' Equity (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Stockholders' Equity Note [Abstract]    
Defined benefit and other postretirement liability adjustments $ (203) $ (203)
Cumulative translation adjustments (83) (82)
Other (67) (70)
Total accumulated other comprehensive loss $ (353) $ (355)