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Investment Securities - Gross Unrealized Losses (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 0
Estimated Fair Value, 12 months or more | 152 | 1,154
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | 0 | 0
Gross Unrealized Losses, 12 months or more | (12) | (19)
State and municipal obligations |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 0
Estimated Fair Value, 12 months or more | 22 | 33
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | 0 | 0
Gross Unrealized Losses, 12 months or more | (9) | (6)
U.S. Government treasury obligations |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 0
Estimated Fair Value, 12 months or more | 123 | 1,114
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | 0 | 0
Gross Unrealized Losses, 12 months or more | (2) | (12)
Mortgage-backed securities |  |
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | 0 | 0
Estimated Fair Value, 12 months or more | 7 | 7
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | 0 | 0
Gross Unrealized Losses, 12 months or more | $ (1) | $ (1)

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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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