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Debt - Narrative (Details)
12 Months Ended
Oct. 20, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 22, 2016
USD ($)
Jun. 30, 2016
USD ($)
Aug. 31, 2015
USD ($)
Aug. 18, 2015
USD ($)
May 26, 2015
USD ($)
Debt Instrument [Line Items]                
Annual long term debt maturity year 2017   $ 0            
Annual long term debt maturity year 2018   398,000,000            
Annual long term debt maturity year 2019   0            
Annual long term debt maturity 2020   696,000,000            
Annual long term debt maturity 2021   0            
Annual long term debt maturity thereafter   $ 2,500,000,000            
Indebtedness to cash flow (not greater than)   4            
Commercial Paper                
Debt Instrument [Line Items]                
Commercial paper, borrowings outstanding   $ 0 $ 143,000,000          
Senior Notes                
Debt Instrument [Line Items]                
Debt face amount           $ 2,000,000,000.0 $ 2,000,000,000.0  
2.95% Senior Notes, due 2027 | Senior Notes                
Debt Instrument [Line Items]                
Debt face amount       $ 500,000,000        
Interest rate   2.95%   2.95%        
5.9% Senior Notes, due 2017 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate 5.90% 5.90%            
Early repayment of senior debt $ 400,000,000              
2.5% Senior Notes, due 2018 | Senior Notes                
Debt Instrument [Line Items]                
Debt face amount             $ 400,000,000  
Interest rate   2.50%         2.50%  
3.3% Senior Notes, due 2020 | Senior Notes                
Debt Instrument [Line Items]                
Debt face amount             $ 700,000,000  
Interest rate   3.30%         3.30%  
4.4% Senior Notes, due 2026 | Senior Notes                
Debt Instrument [Line Items]                
Debt face amount             $ 900,000,000  
Interest rate   4.40%         4.40%  
4.0% Senior Notes, due 2025 | Senior Notes                
Debt Instrument [Line Items]                
Debt face amount               $ 700,000,000
Interest rate   4.00%           4.00%
Five-year Revolving Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit facility, maximum borrowing capacity         $ 1,200,000,000.0      
Commercial paper, borrowing term   5 years            
Commitment fee   0.15%            
Five-year Revolving Credit Facility | Commercial Paper                
Debt Instrument [Line Items]                
Commercial paper, borrowings outstanding   $ 0 $ 143,000,000          
Commercial paper, weighted average interest rate     0.95%          
Commercial paper, weighted average term     17 days          
Minimum | Five-year Revolving Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Commitment fee   0.10%            
Maximum | Five-year Revolving Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Commitment fee   0.20%