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Investments in Securities - Available-for-sale Securities 3 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains $ 46 $ 9 $ 59 $ 30
Total proceeds (excludes initial sale of securities from new portfolio securitizations) $ 467 $ 71 $ 582 $ 121