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Investment Securities - Gross Unrealized Losses Ratio to Fair Value (Details) $ in Millions | Mar. 31, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
--- | --- | ---
Number of Securities |  |
Less than 12 months | security | 0 | 0
12 months or more | security | 9 | 45
Total | security | 9 | 45
Estimated Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or more | 145 | 152
Total | 145 | 152
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (9) | (12)
Total | $ (9) | $ (12)
90–100% |  |
Number of Securities |  |
Less than 12 months | security | 0 | 0
12 months or more | security | 5 | 30
Total | security | 5 | 30
Estimated Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or more | 128 | 129
Total | 128 | 129
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (2) | (3)
Total | $ (2) | $ (3)
Less than 90% |  |
Number of Securities |  |
Less than 12 months | security | 0 | 0
12 months or more | security | 4 | 15
Total | security | 4 | 15
Estimated Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or more | 17 | 23
Total | 17 | 23
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (7) | (9)
Total | $ (7) | $ (9)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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