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Derivatives - Interest-Rate Derivatives (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Interest Rate Swap, 6.348%  
Derivative [Line Items]  
Notional Principal Amount $ 400
Weighted-Average Interest Rate 6.348%
Interest Rate Swap, 6.662%  
Derivative [Line Items]  
Notional Principal Amount $ 350
Weighted-Average Interest Rate 6.662%
Interest Rate Swap, 6.709%  
Derivative [Line Items]  
Notional Principal Amount $ 275
Weighted-Average Interest Rate 6.709%
Interest Rate Swap, 6.445%  
Derivative [Line Items]  
Notional Principal Amount $ 450
Weighted-Average Interest Rate 6.445%
Interest Rate Swaps  
Derivative [Line Items]  
Net cash payments related to settlements $ 47
Collateral paid with respect to interest rate swap agreements $ 92