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Other Comprehensive Income Information (Amounts Reclassified Out Of Acc Other Comp 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 Loss Before Tax [Abstract]        
Foreign exchange translation gain/(loss) included in net income (Statement of Income line: Other Income)     $ (234)  
Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs [1] $ (450) $ (415) $ (1,215) $ (1,248)
[1]
These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 6 – Pension and Other Postretirement Benefits for additional details.)