Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps and Caps (Details)

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Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps and Caps (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Average Notional Amount $ 19,986,874,000 $ 51,015,819,000
Interest Rate Contract [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Net interest expense (income) on interest rate swaps and caps 1,700,000 (12,600,000)
Net Long Position [Member] | Interest Rate Contract [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Average Notional Amount $ 13,500,000,000 $ 42,700,000,000