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Shareholders' Equity (Reclassification out of AOCI) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial loss $ (68) $ 78 $ 62 $ 239
Tax benefit $ 11 $ (19) (27) (61)
Accumulated pension liability adjustments | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial loss     (22) (39)
Tax benefit     4 7
Net pension and post-retirement benefits     $ (18) $ (32)