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Investment Securities - Non-marketable and Other Securities Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Investment
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Investment
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Investment
Investment Holdings [Line Items]          
Investments in qualified affordable housing projects, net $ 696   $ 696   $ 616
Other liabilities 415   415   370
Tax credits and other tax benefits recognized 26 $ 20 54 $ 31  
Amortization expense included in provision for income taxes 14 $ 10 30 $ 22  
Fair value accounting | Unconsolidated venture capital and private equity fund investments          
Investment Holdings [Line Items]          
Nonmarketable securities $ 187   $ 187   $ 185
Upper Limit          
Investment Holdings [Line Items]          
Percentage of ownership 5.00%        
Non-marketable securities | Fair value accounting | Unconsolidated venture capital and private equity fund investments          
Investment Holdings [Line Items]          
Number of investments | Investment 157   157   162