Pledged Assets and Collateral, Pledged Assets (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
Mar. 31, 2025 |
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| Security Owned and Pledged as Collateral, [Abstract] | |||||||
| Trading assets | $ 221,711 | $ 227,935 | |||||
| Available-for-sale debt securities | 222,873 | 213,573 | |||||
| Held-to-maturity debt securities | 204,080 | 208,023 | |||||
| Total loans | 1,016,787 | 986,167 | $ 913,842 | ||||
| Total assets | 2,205,752 | [1] | 2,148,631 | [1] | $ 1,950,311 | ||
| Asset pledged as collateral [Member] | |||||||
| Security Owned and Pledged as Collateral, [Abstract] | |||||||
| Total assets | 1,089,756 | 1,020,164 | |||||
| Pledged to counterparties that had the right to sell or repledge [Member] | |||||||
| Security Owned and Pledged as Collateral, [Abstract] | |||||||
| Trading assets | 149,500 | 145,519 | |||||
| Available-for-sale debt securities | 0 | 563 | |||||
| Total loans | 1,136 | 1,161 | |||||
| Total assets | 150,636 | 147,243 | |||||
| Pledged to counterparties that did not have the right to sell or repledge [Member] | |||||||
| Security Owned and Pledged as Collateral, [Abstract] | |||||||
| Trading assets | 6,574 | 6,953 | |||||
| Available-for-sale debt securities | 158,729 | 150,765 | |||||
| Held-to-maturity debt securities | 187,826 | 189,730 | |||||
| Total loans | 585,044 | 524,290 | |||||
| All other assets | 947 | 1,183 | |||||
| Total assets | $ 939,120 | $ 872,921 | |||||
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- Definition Amount of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of all other pledged assets not separately listed. No definition available.
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- Definition Financing receivable amortized cost, and net investment in sales-type and direct financing leases, excluding accrued interest, before allowance for credit loss. No definition available.
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- Definition Security Owned and Pledged as Collateral No definition available.
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- Definition The fair value amount, after the effects of master netting arrangements, as of the balance sheet date that pertains to financial instruments classified as trading: (1) debt and equity securities, (2) derivative assets, (3) physical commodities inventory, (4) loans held for sale, and (5) other assets classified as trading. No definition available.
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