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Debt and Interest Costs - Activity (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Revolving credit facility      
Carrying value $ 7,500   $ 7,400
Ownership interest in guarantor subsidiaries (as a percent) 100.00%    
Debt Instrument, Covenant Maximum Leverage Ratio 5    
Forecast      
Revolving credit facility      
Debt Instrument, Covenant Maximum Leverage Ratio   4  
Letter of Credit      
Revolving credit facility      
Carrying value $ 32   32
Level 2      
Revolving credit facility      
Fair value of the long-term debt 7,800   7,700
2018 Revolver      
Revolving credit facility      
Maximum borrowing capacity of revolving credit facility 1,500    
Committed multi-currency revolving credit facilities      
Revolving credit facility      
Available borrowing capacity under line of credit facility 1,100    
Short-term uncommitted credit facilities      
Revolving credit facility      
Available borrowing capacity under line of credit facility 902    
Amount of credit facility outstanding and due on demand $ 418   $ 143