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Debt Securities (Investments in Debt Securities, Classified as Available-For-Sale) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | $ 9,170 | $ 9,317
Debt Securities, Gross unrealized gains | 9 | 127
Debt Securities, Gross unrealized losses | (1,009) | (82)
Debt securities, Estimated fair value | 8,170 | 9,362
U.S. Treasury bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | 309 | 123
Debt Securities, Gross unrealized gains | 1 | 1
Debt Securities, Gross unrealized losses | (7) | (1)
Debt securities, Estimated fair value | 303 | 123
Municipal bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | 1,671 | 1,607
Debt Securities, Gross unrealized gains | 3 | 59
Debt Securities, Gross unrealized losses | (195) | (17)
Debt securities, Estimated fair value | 1,479 | 1,649
Foreign government bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | 208 | 228
Debt Securities, Gross unrealized gains | 0 | 2
Debt Securities, Gross unrealized losses | (14) | (3)
Debt securities, Estimated fair value | 194 | 227
Governmental agency bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | 248 | 175
Debt Securities, Gross unrealized gains | 0 | 3
Debt Securities, Gross unrealized losses | (19) | (1)
Debt securities, Estimated fair value | 229 | 177
Governmental agency mortgage-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | 5,253 | 5,620
Debt Securities, Gross unrealized gains | 1 | 34
Debt Securities, Gross unrealized losses | (653) | (47)
Debt securities, Estimated fair value | 4,601 | 5,607
U.S. corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | 1,004 | 1,071
Debt Securities, Gross unrealized gains | 2 | 19
Debt Securities, Gross unrealized losses | (85) | (9)
Debt securities, Estimated fair value | 921 | 1,081
Foreign corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt Securities, Amortized cost | 477 | 493
Debt Securities, Gross unrealized gains | 2 | 9
Debt Securities, Gross unrealized losses | (36) | (4)
Debt securities, Estimated fair value | $ 443 | $ 498

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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