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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Statutory income tax rate (as a percent) 35.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
U.S. statutory rate at 35% $ 269 $ 224 $ 182
Tax on foreign income (88) (74) (67)
Valuation allowance (14) 21 (70)
Tax contingencies 11 13 (1)
Non-deductible impairment charges 0 0 18
Tax law changes 3 4 (17)
Other items, net 5 (10) (2)
Total $ 186 $ 178 $ 43