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Derivative Instruments and Hedging Activity - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]      
Derivative Instruments with Contingent Features Liabilities, at Fair Value   $ 971 $ 420
Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount   $ 7,082 $ 6,859
Interest Rate Contract [Member]      
Derivative [Line Items]      
Gains reclassified from AOCI to interest expense $ 6