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Derivatives - Interest-Rate Swaps (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Aug. 31, 2021
Dec. 31, 2020
Interest Rate Swaps      
Derivative [Line Items]      
Net cash payments related to settlements $ 885    
Collateral paid with respect to interest rate swap agreements 61    
Collateral paid netted against derivative liabilities 313   $ 374
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 Swap, 6.348% and 6.662%      
Derivative [Line Items]      
Net cash payments related to settlements $ 815    
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%