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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
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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

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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