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Income Taxes (Reconciliation of Provision for Income Taxes to U.S. Federal Income Tax Rate) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Statutory income tax rate 35.00% 35.00% 35.00% 35.00%
U.S. statutory rate at 35% $ 89 $ 73 $ 225 $ 178
Tax on foreign income (30) (27) (71) (66)
Tax contingencies 8 0 9 8
Valuation allowance (27) 2 (25) 7
Other items, net 8 0 13 7
Income tax provision $ 48 $ 48 $ 151 $ 134