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Subsequent Events (Details) - USD ($)
Mar. 23, 2020
Feb. 02, 2020
Commercial Paper    
Subsequent Event [Line Items]    
Maximum borrowing capacity of credit facility   $ 3,000,000,000.0
Revolving Credit Facility    
Subsequent Event [Line Items]    
Maximum borrowing capacity of credit facility   3,000,000,000.0
364-day Back-up Credit Facility | Revolving Credit Facility    
Subsequent Event [Line Items]    
Maximum borrowing capacity of credit facility   $ 1,000,000,000.0
Subsequent event | Commercial Paper    
Subsequent Event [Line Items]    
Maximum borrowing capacity of credit facility $ 6,000,000,000.0  
Subsequent event | 364-day Back-up Credit Facility | Revolving Credit Facility    
Subsequent Event [Line Items]    
Maximum borrowing capacity of credit facility $ 3,500,000,000