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Debt and Interest Costs - Debt refinancing (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Debt Refinancing and Other Costs: (Abstract)      
Economic hedge - interest rate risk     $ (30)
Individually insignificant items $ (2) $ (1) (2)
Debt refinancing and other costs $ (2) $ (1) (108)
Senior Notes 3.5 Percent And 4.375 Percent      
Debt Refinancing and Other Costs: (Abstract)      
Interest expense on 3.5% and 4.375% senior notes     (49)
Bridge And Revolving Credit Facilities      
Debt Refinancing and Other Costs: (Abstract)      
Refinance of bridge and revolving credit facilities     (20)
Bridge Facility      
Debt Refinancing and Other Costs: (Abstract)      
Amortization of unsecured, committed bridge facility financing fees     $ (7)