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Shareholders' Equity (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Stockholders' Equity Note [Abstract]    
Defined benefit and other postretirement liability adjustments $ (325) $ (334)
Cumulative translation adjustments (81) (80)
Other (57) (55)
Total accumulated other comprehensive loss $ (463) $ (469)