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Shareholders' Equity (Reclassification out of AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Gain on disposition of assets $ 28 $ 8 $ 28 $ 8
Tax expense (benefit) (23) (10) (42) (31)
Net foreign currency translation adjustments realized 0 (1) 0 (1)
Amortization of income $ 91 $ 18 161 19
Accumulated pension liability adjustments | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax expense (benefit)     (3) (4)
Amortization of income     (25) (21)
Net pension and post-retirement benefits     $ (22) $ (17)