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Investment Securities - Gross Unrealized Losses Ratio to Fair Value (Details) $ in Millions | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Available-for-sale investment securities with gross unrealized losses |  |
Number of Securities, Less than 12 months | security | 0 | 88
Number of Securities, 12 months or more | security | 71 | 3
Number of Securities, Total | security | 71 | 91
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 4,311
Estimated Fair Value, 12 months or more | 1,154 | 52
Estimated Fair Value, Total | 1,154 | 4,363
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | 0 | (83)
Gross Unrealized Losses, 12 months or more | (19) | (1)
Gross Unrealized Losses, Total | $ (19) | $ (84)
90%–100% |  |
Available-for-sale investment securities with gross unrealized losses |  |
Number of Securities, Less than 12 months | security | 0 | 74
Number of Securities, 12 months or more | security | 69 | 3
Number of Securities, Total | security | 69 | 77
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 4,287
Estimated Fair Value, 12 months or more | 1,140 | 52
Estimated Fair Value, Total | 1,140 | 4,339
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | 0 | (74)
Gross Unrealized Losses, 12 months or more | (14) | (1)
Gross Unrealized Losses, Total | $ (14) | $ (75)
Less than 90% |  |
Available-for-sale investment securities with gross unrealized losses |  |
Number of Securities, Less than 12 months | security | 0 | 14
Number of Securities, 12 months or more | security | 2 | 0
Number of Securities, Total | security | 2 | 14
Available-for-sale investment securities with gross unrealized losses and length of time |  |
Estimated Fair Value, Less than 12 months | $ 0 | $ 24
Estimated Fair Value, 12 months or more | 14 | 0
Estimated Fair Value, Total | 14 | 24
Available-for-sale investment securities with gross unrealized losses |  |
Gross Unrealized Losses, Less than 12 months | 0 | (9)
Gross Unrealized Losses, 12 months or more | (5) | 0
Gross Unrealized Losses, Total | $ (5) | $ (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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- 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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