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Shareholders' Equity (Reclassification out of AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gain on disposition of assets   $ (61) $ (7) $ (2)
Amortization of loss   312 (777) 300
Tax benefit (expense) $ (391) (86) (421) (129)
Net foreign currency translation adjustments realized   (4) (1) $ (1)
Accumulated pension liability adjustments | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of loss   (48) (42)  
Tax benefit (expense)   9 8  
Net pension and post-retirement benefits   $ (39) $ (34)