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Investment Securities - Summary of Unrealized Losses on Available-for-Sale Securities (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Investment
Dec. 31, 2020
USD ($)
Investment
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months - Fair Value of Investments $ 14,050 $ 4,285
Less than 12 months - Unrealized Losses (229) (15)
12 months or longer - Fair Value of Investments 76 0
12 months or longer - Unrealized Losses (1) 0
Fair Value of Investments 14,126 4,285
Unrealized Losses $ (230) $ (15)
Number of investments in unrealized loss position | Investment 344 93
Number of investments with unrealized losses greater than 12 months | Investment 2 0
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months - Fair Value of Investments $ 2,218 $ 60
Less than 12 months - Unrealized Losses (5) 0
12 months or longer - Fair Value of Investments 0 0
12 months or longer - Unrealized Losses 0 0
Fair Value of Investments 2,218 60
Unrealized Losses (5) 0
U.S. agency debentures    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months - Fair Value of Investments 81 133
Less than 12 months - Unrealized Losses (3) (1)
12 months or longer - Fair Value of Investments 0 0
12 months or longer - Unrealized Losses 0 0
Fair Value of Investments 81 133
Unrealized Losses (3) (1)
Residential mortgage-backed securities | Agency-issued mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months - Fair Value of Investments 8,268 904
Less than 12 months - Unrealized Losses (124) (1)
12 months or longer - Fair Value of Investments 0 0
12 months or longer - Unrealized Losses 0 0
Fair Value of Investments 8,268 904
Unrealized Losses (124) (1)
Residential mortgage-backed securities | Agency-issued collateralized mortgage obligations—fixed rate    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months - Fair Value of Investments 2,832 2,199
Less than 12 months - Unrealized Losses (89) (10)
12 months or longer - Fair Value of Investments 76 0
12 months or longer - Unrealized Losses (1) 0
Fair Value of Investments 2,908 2,199
Unrealized Losses (90) (10)
Agency-issued commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months - Fair Value of Investments 651 989
Less than 12 months - Unrealized Losses (8) (3)
12 months or longer - Fair Value of Investments 0 0
12 months or longer - Unrealized Losses 0 0
Fair Value of Investments 651 989
Unrealized Losses $ (8) $ (3)