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Investment Securities - Gains and Losses Recognized in Income from Securities (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Available-for-sale debt and other securities: |  |
Realized gains | $ 5 | $ 2
Realized losses | (5) | 0
Impairment losses | 0 | (5)
Net losses on available-for-sale debt and other securities | 0 | (3)
Equity securities: |  |
Net unrealized (losses) gains | (9) | 13
Net equity securities (losses) gains | (9) | 13
Total (losses) gains recognized in income from available-for-sale debt and other securities, trading debt securities and equity securities | (9) | 10
Commercial Banking Revenue and Wealth and Asset Management Revenue |  |
Equity securities: |  |
Total (losses) gains recognized in income from available-for-sale debt and other securities, trading debt securities and equity securities | $ 4 | $ 2

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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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