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Borrowings - Narrative (Details)
Sep. 18, 2020
USD ($)
Sep. 02, 2020
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jul. 26, 2021
USD ($)
Senior Notes          
Debt Instrument [Line Items]          
Debt issued, amount         $ 1,300,000,000
Unamortized discount and loan issuance costs on long-term debt         27,500,000
Senior Notes | Senior Notes Due 2031          
Debt Instrument [Line Items]          
Debt issued, amount         600,000,000
Senior Notes | Senior Notes Due 2051          
Debt Instrument [Line Items]          
Debt issued, amount         700,000,000
Debt issuance costs         $ 12,300,000
Weighted average coupon rate (as a percent)     2.80%    
Weighted average effective interest rate (as a percent)     3.06%    
Unsecured Debt | The Notes          
Debt Instrument [Line Items]          
Debt issued, amount   $ 6,000,000,000      
Unamortized discount and loan issuance costs on long-term debt   149,000,000 $ (193,800,000)    
Debt issuance costs   $ 40,400,000      
Weighted average coupon rate (as a percent)     2.125%    
Weighted average effective interest rate (as a percent)     2.50%    
Unsecured Debt | The Notes | Level 2          
Debt Instrument [Line Items]          
Fair value of outstanding Notes     $ 5,900,000,000 $ 7,200,000,000  
Unsecured Debt | The Notes | Prior to the applicable par call date          
Debt Instrument [Line Items]          
Redemption price (as a percent)   100.00%      
Unsecured Debt | The Notes | Upon occurrence of a change of control triggering event          
Debt Instrument [Line Items]          
Redemption price (as a percent)   101.00%      
Unsecured Debt | Senior Unsecured Revolving Credit Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt instrument, term 5 years        
Line of credit, maximum borrowing capacity $ 1,500,000,000        
Outstanding borrowings     $ 0 $ 0  
Maximum consolidated leverage ratio 4.00        
Maximum consolidated leverage ratio following qualifying material acquisition 4.50        
Minimum consolidated coverage ratio 2.50        
Unsecured Debt | Senior Unsecured Revolving Credit Facility | Federal Funds Rate | Revolving Credit Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate (percentage) 0.50%        
Unsecured Debt | Senior Unsecured Revolving Credit Facility | Overnight Bank Funding Rate | Revolving Credit Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate (percentage) 0.50%        
Unsecured Debt | Senior Unsecured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate (percentage) 1.00%