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Debt - Other Indebtedness (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2015
Dec. 31, 2019
Dec. 31, 2018
LIBOR | Effective Rate Calculation Option 2      
Debt Instrument [Line Items]      
Coupon rate, floating rate notes 1.00%    
Federal Funds Effective Rate      
Debt Instrument [Line Items]      
Coupon rate, floating rate notes 0.50%    
Commercial Paper      
Debt Instrument [Line Items]      
Outstanding debt   $ 0 $ 0
Commercial Paper | Revolving Credit Facility      
Debt Instrument [Line Items]      
Borrowing capacity reserved, commercial paper   1,500,000,000  
Unsecured Debt | Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt term 5 years    
Outstanding debt   0  
Maximum borrowing capacity   2,000,000,000  
Allowable increase in borrowing capacity, maximum $ 1,000,000,000    
Remaining borrowing capacity   $ 500,000,000  
Minimum | LIBOR | Effective Rate Calculation Option 1      
Debt Instrument [Line Items]      
Coupon rate, floating rate notes 0.875%    
Minimum | LIBOR | Effective Rate Calculation Option 3      
Debt Instrument [Line Items]      
Coupon rate, floating rate notes 0.00%    
Maximum | LIBOR | Effective Rate Calculation Option 1      
Debt Instrument [Line Items]      
Coupon rate, floating rate notes 1.50%    
Maximum | LIBOR | Effective Rate Calculation Option 3      
Debt Instrument [Line Items]      
Coupon rate, floating rate notes 0.50%    
Maximum | Commercial Paper      
Debt Instrument [Line Items]      
Debt term   397 days