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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
Mar. 31, 2016
Mar. 31, 2015
Other Comprehensive Income Information [Abstract]    
Foreign exchange translation adjustment $ (11) $ 90
Postretirement benefits reserves adjustment (excluding amortization) 80 (377)
Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs (125) (160)
Unrealized change in fair value of stock investments   (1)
Realized change in fair value of stock investments included in net income   (4)
Total $ (56) $ (452)