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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Gain resulting from observable price changes | $ 0 | $ 0 | $ 0 | $ 4 |
Positive adjustments, cumulative amount | 23 |  | 23 |  |
Private equity, impairment | 13 | 0 | 13 | 0 |
Private equity, cumulative impairment | 28 |  | 28 |  |
Residential Mortgage |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Fair value changes included in earnings for residential mortgage for which the fair value option was elected | (12) | $ (7) | (35) | $ (9) |
Credit risk of fair value option |  |  | 0 |  | $ 0
Commercial |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Fair value changes included in earnings for residential mortgage for which the fair value option was elected | $ 0 |  | 0 |  |
Credit risk of fair value option |  |  | $ 0 |  |

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- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of cumulative impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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