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Debt - Narrative (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Nov. 13, 2020
USD ($)
Aug. 18, 2017
Aug. 17, 2017
USD ($)
Nov. 13, 2013
USD ($)
Line of Credit Facility [Line Items]            
Repayments of commercial paper $ 445,000,000 $ 1,006,000,000        
NYSE Notes            
Line of Credit Facility [Line Items]            
Senior unsecured fixed rate debt           $ 850,000,000
Percentage bearing fixed interest rate           2.00%
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity 3,400,000,000.0          
Additional borrowing capacity (up to) 975,000,000          
Maximum leverage ratio       3.50    
Amount of debt outstanding 0          
Debt issuance costs 5,000,000          
Funds available to use for working capital and general and corporate purposes 2,200,000,000          
Revolving Credit Facility | Minimum            
Line of Credit Facility [Line Items]            
Maximum leverage ratio       3.50    
Revolving Credit Facility | Maximum            
Line of Credit Facility [Line Items]            
Maximum leverage ratio       4.00    
Senior Notes            
Line of Credit Facility [Line Items]            
Debt issuance costs         $ 8,000,000  
Senior unsecured fixed rate debt         1,000,000,000.0  
Senior Notes | 2022 Senior Notes            
Line of Credit Facility [Line Items]            
Senior unsecured fixed rate debt         $ 500,000,000  
Percentage bearing fixed interest rate         2.35%  
Senior Notes | 2027 Senior Notes            
Line of Credit Facility [Line Items]            
Senior unsecured fixed rate debt         $ 500,000,000  
Percentage bearing fixed interest rate         3.10%  
Commercial Paper | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Funds reserved for commercial paper program $ 1,200,000,000          
Weighted average interest rate 1.23%          
Weighted average maturity period 29 days          
Repayments of commercial paper $ 445,000,000          
Commercial Paper | Revolving Credit Facility | Minimum            
Line of Credit Facility [Line Items]            
Commercial paper maturities 2 days          
Commercial Paper | Revolving Credit Facility | Maximum            
Line of Credit Facility [Line Items]            
Commercial paper maturities 75 days          
Scenario, Forecast | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity     $ 3,200,000,000.0