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Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 67,612 $ 82,994
U.S. agency mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 46,290 51,833
U.S. Treasury securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 9,391 14,469
Corporate debt securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 6,241 9,579
Asset-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4,674 5,910
U.S. state and municipal securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 557 549
Foreign government agency securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 329 527
Non-agency commercial mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 111 109
Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 19 18
Fair Value, Recurring    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 12,921 11,005
Investments segregated and on deposit for regulatory purposes: 23,576 25,740
Fair Value 67,612 82,994
Other assets: 2,728 2,543
Total assets 106,837 122,282
Total accrued expenses and other liabilities 2,423 2,198
Total liabilities 2,423 2,198
Fair Value, Recurring | Money market funds    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 12,921 11,005
Fair Value, Recurring | U.S. government securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments segregated and on deposit for regulatory purposes: 23,576 25,740
Other assets: 19 18
Fair Value, Recurring | U.S. agency mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 46,290 51,833
Fair Value, Recurring | U.S. Treasury securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 9,391 14,469
Fair Value, Recurring | Corporate debt securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 6,241 9,579
Fair Value, Recurring | Asset-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4,674 5,910
Fair Value, Recurring | U.S. state and municipal securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 557 549
Fair Value, Recurring | Foreign government agency securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 329 527
Fair Value, Recurring | Non-agency commercial mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 111 109
Fair Value, Recurring | Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 19 18
Fair Value, Recurring | Total other securities owned    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 2,728 2,543
Fair Value, Recurring | Equity, corporate debt, and other securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 1,566 1,468
Fair Value, Recurring | Mutual funds and ETFs    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 1,102 1,019
Fair Value, Recurring | State and municipal debt obligations    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 41 38
Fair Value, Recurring | Interest rate swaps    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Total accrued expenses and other liabilities 1  
Fair Value, Recurring | Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Total accrued expenses and other liabilities 2,422 2,198
Fair Value, Recurring | Level 1    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 12,921 11,005
Investments segregated and on deposit for regulatory purposes: 0 0
Fair Value 0 0
Other assets: 2,588 2,414
Total assets 15,509 13,419
Total accrued expenses and other liabilities 2,388 2,161
Total liabilities 2,388 2,161
Fair Value, Recurring | Level 1 | Money market funds    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 12,921 11,005
Fair Value, Recurring | Level 1 | U.S. government securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments segregated and on deposit for regulatory purposes: 0 0
Other assets: 0 0
Fair Value, Recurring | Level 1 | U.S. agency mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 1 | U.S. Treasury securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 1 | Corporate debt securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 1 | Asset-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 1 | U.S. state and municipal securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 1 | Foreign government agency securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 1 | Non-agency commercial mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 1 | Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 1 | Total other securities owned    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 2,588 2,414
Fair Value, Recurring | Level 1 | Equity, corporate debt, and other securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 1,486 1,395
Fair Value, Recurring | Level 1 | Mutual funds and ETFs    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 1,102 1,019
Fair Value, Recurring | Level 1 | State and municipal debt obligations    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 0 0
Fair Value, Recurring | Level 1 | Interest rate swaps    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Total accrued expenses and other liabilities 0  
Fair Value, Recurring | Level 1 | Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Total accrued expenses and other liabilities 2,388 2,161
Fair Value, Recurring | Level 2    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Investments segregated and on deposit for regulatory purposes: 23,576 25,740
Fair Value 67,612 82,994
Other assets: 140 129
Total assets 91,328 108,863
Total accrued expenses and other liabilities 35 37
Total liabilities 35 37
Fair Value, Recurring | Level 2 | Money market funds    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Fair Value, Recurring | Level 2 | U.S. government securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments segregated and on deposit for regulatory purposes: 23,576 25,740
Other assets: 19 18
Fair Value, Recurring | Level 2 | U.S. agency mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 46,290 51,833
Fair Value, Recurring | Level 2 | U.S. Treasury securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 9,391 14,469
Fair Value, Recurring | Level 2 | Corporate debt securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 6,241 9,579
Fair Value, Recurring | Level 2 | Asset-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 4,674 5,910
Fair Value, Recurring | Level 2 | U.S. state and municipal securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 557 549
Fair Value, Recurring | Level 2 | Foreign government agency securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 329 527
Fair Value, Recurring | Level 2 | Non-agency commercial mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 111 109
Fair Value, Recurring | Level 2 | Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 19 18
Fair Value, Recurring | Level 2 | Total other securities owned    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 140 129
Fair Value, Recurring | Level 2 | Equity, corporate debt, and other securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 80 73
Fair Value, Recurring | Level 2 | Mutual funds and ETFs    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 0 0
Fair Value, Recurring | Level 2 | State and municipal debt obligations    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 41 38
Fair Value, Recurring | Level 2 | Interest rate swaps    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Total accrued expenses and other liabilities 1  
Fair Value, Recurring | Level 2 | Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Total accrued expenses and other liabilities 34 37
Fair Value, Recurring | Level 3    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Investments segregated and on deposit for regulatory purposes: 0 0
Fair Value 0 0
Other assets: 0 0
Total assets 0 0
Total accrued expenses and other liabilities 0 0
Total liabilities 0 0
Fair Value, Recurring | Level 3 | Money market funds    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents: 0 0
Fair Value, Recurring | Level 3 | U.S. government securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments segregated and on deposit for regulatory purposes: 0 0
Other assets: 0 0
Fair Value, Recurring | Level 3 | U.S. agency mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 3 | U.S. Treasury securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 3 | Corporate debt securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 3 | Asset-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 3 | U.S. state and municipal securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 3 | Foreign government agency securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 3 | Non-agency commercial mortgage-backed securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 3 | Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 0 0
Fair Value, Recurring | Level 3 | Total other securities owned    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 0 0
Fair Value, Recurring | Level 3 | Equity, corporate debt, and other securities    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 0 0
Fair Value, Recurring | Level 3 | Mutual funds and ETFs    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 0 0
Fair Value, Recurring | Level 3 | State and municipal debt obligations    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets: 0 0
Fair Value, Recurring | Level 3 | Interest rate swaps    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Total accrued expenses and other liabilities 0  
Fair Value, Recurring | Level 3 | Other    
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]    
Total accrued expenses and other liabilities $ 0 $ 0