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Investment Securities - Gross Unrealized Losses Ratio to Fair Value (Details) $ in Millions | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Number of Securities |  |
Less than 12 months | security | 0 | 0
12 months or more | security | 10 | 71
Total | security | 10 | 71
Estimated Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or more | 145 | 1,154
Total | 145 | 1,154
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (10) | (19)
Total | $ (10) | $ (19)
90–100% |  |
Number of Securities |  |
Less than 12 months | security | 0 | 0
12 months or more | security | 7 | 69
Total | security | 7 | 69
Estimated Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or more | 129 | 1,140
Total | 129 | 1,140
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (2) | (14)
Total | $ (2) | $ (14)
Less than 90% |  |
Number of Securities |  |
Less than 12 months | security | 0 | 0
12 months or more | security | 3 | 2
Total | security | 3 | 2
Estimated Fair Value |  |
Less than 12 months | $ 0 | $ 0
12 months or more | 16 | 14
Total | 16 | 14
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | (8) | (5)
Total | $ (8) | $ (5)

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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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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: 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 2: 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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