v3.3.1.900
Other Comprehensive Income Information (Amounts Reclassified Out Of Acc Other Comp Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Comprehensive Income Information Before Tax [Abstract]      
Foreign exchange translation gain/(loss) included in net income (Statement of Income line: Other income) $ 14 $ (152) $ 23
Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs [1] (2,066) (1,571) $ (2,616)
Realized change in fair value of stock investments included in net income (Statement of Income line: Other income) $ (42) $ (5)  
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 17 – Pension and Other Postretirement Benefits for additional details.)