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Debt Obligations (Commercial Paper) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Short-term Debt [Line Items]  
Net proceeds from senior note $ 644
Commercial paper  
Short-term Debt [Line Items]  
Weighted average interest rate 1.67%
Commercial paper | Minimum  
Short-term Debt [Line Items]  
Maturity period 20 days
Commercial paper | Maximum  
Short-term Debt [Line Items]  
Maturity period 100 days
Commercial paper | Weighted Average  
Short-term Debt [Line Items]  
Maturity period 51 days
$1 billion senior unsecured revolving credit facility due April 25, 2022  
Short-term Debt [Line Items]  
Net proceeds from senior note $ 799
Outstanding credit facility $ 350