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Investment Securities - Gross Unrealized Losses Ratio to Fair Value (Details) $ in Millions | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Debt Securities, Available-for-Sale [Line Items] |  |
Number of securities, less than 12 months | security | 53 | 88
Estimated fair value, less than 12 months | $ 699 | $ 4,311
Gross unrealized losses, less than 12 months | $ (2) | $ (83)
Number of securities, 12 months or more | security | 76 | 3
Estimated fair value, 12 months or more | $ 2,135 | $ 52
Gross unrealized losses, more than 12 months | $ (37) | $ (1)
Number of securities, total | security | 129 | 91
Estimated fair value, total | $ 2,834 | $ 4,363
Gross unrealized losses, total | $ (39) | $ (84)
90–100% |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Number of securities, less than 12 months | security | 53 | 74
Estimated fair value, less than 12 months | $ 699 | $ 4,287
Gross unrealized losses, less than 12 months | $ (2) | $ (74)
Number of securities, 12 months or more | security | 44 | 3
Estimated fair value, 12 months or more | $ 2,107 | $ 52
Gross unrealized losses, more than 12 months | $ (27) | $ (1)
Number of securities, total | security | 97 | 77
Estimated fair value, total | $ 2,806 | $ 4,339
Gross unrealized losses, total | $ (29) | $ (75)
Less than 90% |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Number of securities, less than 12 months | security | 0 | 14
Estimated fair value, less than 12 months | $ 0 | $ 24
Gross unrealized losses, less than 12 months | $ 0 | $ (9)
Number of securities, 12 months or more | security | 32 | 0
Estimated fair value, 12 months or more | $ 28 | $ 0
Gross unrealized losses, more than 12 months | $ (10) | $ 0
Number of securities, total | security | 32 | 14
Estimated fair value, total | $ 28 | $ 24
Gross unrealized losses, total | $ (10) | $ (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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- 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 less 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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