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Debt and Interest Costs - Debt refinancing (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Debt Refinancing and Other Costs: (Abstract)        
Economic hedge - interest rate risk   $ (4)   $ (20)
Individually insignificant items $ (1)   $ (1)  
Debt refinancing and other costs $ (1) (46) $ (1) (106)
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   (25)   (49)
Bridge And Revolving Credit Facilities        
Debt Refinancing and Other Costs: (Abstract)        
Refinance of bridge and revolving credit facilities   $ (17)   (30)
Bridge Facility        
Debt Refinancing and Other Costs: (Abstract)        
Amortization of unsecured, committed bridge facility financing fees       $ (7)