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Debt Securities (Gross Unrealized Losses on Investments in Debt Securities) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | $ 3,865 | $ 5,739
Unrealized losses, Less than 12 months | (267) | (80)
Estimated fair value, 12 months or longer | 3,781 | 33
Unrealized losses, 12 months or longer | (742) | (2)
Estimated fair value, Total | 7,646 | 5,772
Unrealized losses, Total | (1,009) | (82)
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 108 | 76
Unrealized losses, Less than 12 months | (1) | (1)
Estimated fair value, 12 months or longer | 50 | 0
Unrealized losses, 12 months or longer | (6) | 0
Estimated fair value, Total | 158 | 76
Unrealized losses, Total | (7) | (1)
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 813 | 684
Unrealized losses, Less than 12 months | (56) | (17)
Estimated fair value, 12 months or longer | 540 | 0
Unrealized losses, 12 months or longer | (139) | 0
Estimated fair value, Total | 1,353 | 684
Unrealized losses, Total | (195) | (17)
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 142 | 103
Unrealized losses, Less than 12 months | (6) | (1)
Estimated fair value, 12 months or longer | 46 | 33
Unrealized losses, 12 months or longer | (8) | (2)
Estimated fair value, Total | 188 | 136
Unrealized losses, Total | (14) | (3)
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 173 | 73
Unrealized losses, Less than 12 months | (8) | (1)
Estimated fair value, 12 months or longer | 56 | 0
Unrealized losses, 12 months or longer | (11) | 0
Estimated fair value, Total | 229 | 73
Unrealized losses, Total | (19) | (1)
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 1,860 | 4,036
Unrealized losses, Less than 12 months | (141) | (47)
Estimated fair value, 12 months or longer | 2,627 | 0
Unrealized losses, 12 months or longer | (512) | 0
Estimated fair value, Total | 4,487 | 4,036
Unrealized losses, Total | (653) | (47)
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 528 | 533
Unrealized losses, Less than 12 months | (38) | (9)
Estimated fair value, 12 months or longer | 325 | 0
Unrealized losses, 12 months or longer | (47) | 0
Estimated fair value, Total | 853 | 533
Unrealized losses, Total | (85) | (9)
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 241 | 234
Unrealized losses, Less than 12 months | (17) | (4)
Estimated fair value, 12 months or longer | 137 | 0
Unrealized losses, 12 months or longer | (19) | 0
Estimated fair value, Total | 378 | 234
Unrealized losses, Total | $ (36) | $ (4)

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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/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 Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + 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://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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