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Investment Securities (Details 1) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Estimated fair value, less than 12 months | $ 1,503 | $ 4,311
Gross unrealized losses, less than 12 months | (14) | (83)
Estimated fair value, 12 months or more | 2,153 | 52
Gross unrealized losses, more than 12 months | (45) | (1)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated fair value, less than 12 months | 0 | 52
Gross unrealized losses, less than 12 months | 0 | (10)
Estimated fair value, 12 months or more | 31 | 0
Gross unrealized losses, more than 12 months | (8) | 0
U.S. Government treasury obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated fair value, less than 12 months | 982 | 3,710
Gross unrealized losses, less than 12 months | (13) | (72)
Estimated fair value, 12 months or more | 2,122 | 52
Gross unrealized losses, more than 12 months | (37) | (1)
Foreign government bonds and obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated fair value, less than 12 months | 521 | 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 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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