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Debt - Narrative (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
renewal_option
May 02, 2020
USD ($)
note
May 01, 2020
USD ($)
Feb. 01, 2020
USD ($)
Jun. 30, 2019
USD ($)
May 04, 2019
USD ($)
Debt Instrument [Line Items]                
Short-term debt       $ 805,000,000   $ 0   $ 0
Proceeds from debt issuance, net of discounts and other issuance costs $ 1,973,000,000              
Total unamortized discount and debt issuance costs       $ 29,400,000   2,100,000   2,400,000
Number of series notes | note       6        
$800 million revolving credit facility                
Debt Instrument [Line Items]                
Current borrowing capacity         $ 800,000,000   $ 600,000,000  
Sublimit for issuance of standby letters of credit     $ 300,000,000          
Maximum borrowing capacity (up to)     $ 300,000,000 $ 800,000,000        
Number of renewal options | renewal_option     2          
Renewal option, term     1 year          
Proceeds from borrowings 2,000,000,000.0 $ 800,000,000            
Basis points margin over LIBOR (percent)   0.875%            
Interest rate (percent)       1.76%        
Amount outstanding under the revolving credit facility       $ 800,000,000        
Standby Letters of Credit                
Debt Instrument [Line Items]                
Amount outstanding under the revolving credit facility       $ 0        
Senior Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity (up to)         $ 500,000,000      
Basis points margin over LIBOR (percent)       1.75%        
Short-term debt       $ 0        
Borrowing capacity       500,000,000        
Level 1                
Debt Instrument [Line Items]                
Unsecured senior notes estimated fair value       2,500,000,000   $ 335,000,000   $ 318,000,000
6.53% Series B Senior Notes due 2021 | 6.530% Series B Senior Notes due 2021                
Debt Instrument [Line Items]                
Debt instrument       $ 65,000,000        
Unsecured senior notes interest rate (percent)       6.53%        
3.375% Senior Notes due 2024                
Debt Instrument [Line Items]                
Debt instrument       $ 250,000,000        
Unsecured senior notes interest rate (percent)       3.375%        
4.600% Senior Notes due 2025                
Debt Instrument [Line Items]                
Debt instrument 700,000,000              
Unsecured senior notes interest rate (percent)       4.60%        
4.700% Senior Notes due 2027                
Debt Instrument [Line Items]                
Debt instrument $ 400,000,000              
Unsecured senior notes interest rate (percent) 4.70%     4.70%        
4.800% Senior Notes due 2030                
Debt Instrument [Line Items]                
Debt instrument $ 400,000,000              
Unsecured senior notes interest rate (percent) 4.80%     4.80%        
5.450% Senior Notes due 2050                
Debt Instrument [Line Items]                
Debt instrument $ 500,000,000              
Unsecured senior notes interest rate (percent) 5.45%     5.45%