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Investment Securities - Gross Unrealized Losses (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-Sale [Line Items] |  |
Estimated fair value, less than 12 months | $ 699 | $ 4,311
Gross unrealized losses, less than 12 months | (2) | (83)
Estimated fair value, 12 months or more | 2,135 | 52
Gross unrealized losses, more than 12 months | (37) | (1)
State and municipal obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Estimated fair value, less than 12 months | 20 | 52
Gross unrealized losses, less than 12 months | (1) | (10)
Estimated fair value, 12 months or more | 30 | 0
Gross unrealized losses, more than 12 months | (9) | 0
U.S. Government treasury obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Estimated fair value, less than 12 months | 0 | 3,710
Gross unrealized losses, less than 12 months | 0 | (72)
Estimated fair value, 12 months or more | 2,098 | 52
Gross unrealized losses, more than 12 months | (27) | (1)
Mortgage-backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Estimated fair value, less than 12 months | 0 | 0
Gross unrealized losses, less than 12 months | 0 | 0
Estimated fair value, 12 months or more | 7 | 0
Gross unrealized losses, more than 12 months | (1) | 0
Foreign government bonds and obligations |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Estimated fair value, less than 12 months | 679 | 549
Gross unrealized losses, less than 12 months | (1) | (1)
Estimated fair value, 12 months or more | 0 | 0
Gross unrealized losses, more than 12 months | $ 0 | $ 0

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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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