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Debt - Narrative (Details)
12 Months Ended
Oct. 20, 2016
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 22, 2016
USD ($)
Aug. 31, 2015
USD ($)
Aug. 18, 2015
USD ($)
May 26, 2015
USD ($)
Debt Instrument [Line Items]              
Annual long term debt maturity year 2018   $ 0          
Annual long term debt maturity year 2019   0          
Annual long term debt maturity year 2020   697,000,000          
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          
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 (as a percent)   2.95%   2.95%      
5.9% Senior Notes, due 2017 | Senior Notes              
Debt Instrument [Line Items]              
Interest rate (as a percent) 5.90%            
Early repayment of debt $ 400,000,000            
2.5% Senior Notes, due 2018 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount           $ 400,000,000  
Interest rate (as a percent)   2.50%       2.50%  
3.3% Senior Notes, due 2020 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount           $ 700,000,000  
Interest rate (as a percent)   3.30%       3.30%  
4.4% Senior Notes, due 2026 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount           $ 900,000,000  
Interest rate (as a percent)   4.40%       4.40%  
4.0% Senior Notes, due 2025 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount             $ 700,000,000
Interest rate (as a percent)   4.00%         4.00%
Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity     $ 1,200,000,000        
Commitment fee   0.125%          
Five-year Revolving Credit Facility | Revolving Credit Facility Due 2020              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity     $ 1,200,000,000        
Minimum | Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022              
Debt Instrument [Line Items]              
Commitment fee   0.08%          
Maximum | Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022              
Debt Instrument [Line Items]              
Commitment fee   0.175%