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Debt Securities (Gross Unrealized Losses on Investments in Debt Securities) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | $ 5,739 | $ 429
Unrealized losses, Less than 12 months | (80) | (3)
Estimated fair value, 12 months or longer | 33 | 100
Unrealized losses, 12 months or longer | (2) | (1)
Estimated fair value, Total | 5,772 | 529
Unrealized losses, Total | (82) | (4)
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 76 |
Unrealized losses, Less than 12 months | (1) |
Estimated fair value, 12 months or longer | 0 |
Unrealized losses, 12 months or longer | 0 |
Estimated fair value, Total | 76 |
Unrealized losses, Total | (1) |
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 684 | 74
Unrealized losses, Less than 12 months | (17) | (1)
Estimated fair value, 12 months or longer | 0 | 0
Unrealized losses, 12 months or longer | 0 | 0
Estimated fair value, Total | 684 | 74
Unrealized losses, Total | (17) | (1)
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 103 | 67
Unrealized losses, Less than 12 months | (1) | (1)
Estimated fair value, 12 months or longer | 33 | 0
Unrealized losses, 12 months or longer | (2) | 0
Estimated fair value, Total | 136 | 67
Unrealized losses, Total | (3) | (1)
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 73 |
Unrealized losses, Less than 12 months | (1) |
Estimated fair value, 12 months or longer | 0 |
Unrealized losses, 12 months or longer | 0 |
Estimated fair value, Total | 73 |
Unrealized losses, Total | (1) |
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 4,036 | 288
Unrealized losses, Less than 12 months | (47) | (1)
Estimated fair value, 12 months or longer | 0 | 100
Unrealized losses, 12 months or longer | 0 | (1)
Estimated fair value, Total | 4,036 | 388
Unrealized losses, Total | (47) | $ (2)
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 533 |
Unrealized losses, Less than 12 months | (9) |
Estimated fair value, 12 months or longer | 0 |
Unrealized losses, 12 months or longer | 0 |
Estimated fair value, Total | 533 |
Unrealized losses, Total | (9) |
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Estimated fair value, Less than 12 months | 234 |
Unrealized losses, Less than 12 months | (4) |
Estimated fair value, 12 months or longer | 0 |
Unrealized losses, 12 months or longer | 0 |
Estimated fair value, Total | 234 |
Unrealized losses, Total | $ (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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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