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Derivative Instruments and Hedging Activity - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Derivative Instruments with Contingent Features Liabilities, at Fair Value $ 1,103   $ 1,103   $ 420
Interest Rate Swap [Member]          
Derivative [Line Items]          
Notional amount 7,076   7,076   $ 6,859
Interest Rate Contract [Member]          
Derivative [Line Items]          
Gains reclassified from AOCI to interest expense $ 0 $ 0 $ 0 $ 6