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Securities - Pre-Tax Net Securities Gains (Losses) by Type (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Total net securities (losses) | $ (30) | $ (35) | $ (17) | $ (65) | $ (35)
U.S. Treasury |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Total net securities (losses) | (3) | 0 | 0 | 0 | (12)
Other asset-backed securities (“ABS”) |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Total net securities (losses) | 0 | 0 | (13) | 0 | (13)
Non-agency RMBS |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Total net securities (losses) | 0 | (3) | 24 | (3) | 24
Non-U.S. government |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Total net securities (losses) | (11) | (28) | (14) | (39) | (13)
Other |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Total net securities (losses) | $ (16) | $ (4) | $ (14) | $ (23) | $ (21)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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