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Other Comprehensive Income Information (Schedule Of Income Tax (Expense)/Credit For Components Of Other Comprehensive Income) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Comprehensive Income Information [Abstract]        
Foreign exchange translation adjustment $ 17 $ (9) $ (9) $ (6)
Postretirement benefits reserves adjustment (excluding amortization) 74 (11) 154 20
Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs (139) (137) (365) (389)
Total $ (48) $ (157) $ (220) $ (375)