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Derivative Financial Instruments - Basis Swap (Details) - 1:3 basis swaps - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Notional amount $ 5,900,000,000 $ 6,150,000,000
London Interbank Offered Rate (LIBOR)    
Derivative [Line Items]    
Weighted average rate 0.091% 0.091%
Maturity 2021    
Derivative [Line Items]    
Notional amount $ 0 $ 250,000,000
Maturity 2022    
Derivative [Line Items]    
Notional amount 2,000,000,000 2,000,000,000
Maturity 2023    
Derivative [Line Items]    
Notional amount 750,000,000 750,000,000
Maturity 2024    
Derivative [Line Items]    
Notional amount 1,750,000,000 1,750,000,000
Maturity 2026    
Derivative [Line Items]    
Notional amount 1,150,000,000 1,150,000,000
Maturity 2027    
Derivative [Line Items]    
Notional amount $ 250,000,000 $ 250,000,000