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Debt Securities (Debt Securities Investment Portfolio) (Narrative) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 9,362 | $ 6,355
Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 159 |
High Yield Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 83 |
Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 93 |
Non-Investment Grade |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 251 |
Non-Investment Grade | Bank Loans |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | 154 |
Non-Investment Grade | Emerging Market Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Debt securities, Estimated fair value | $ 13 |

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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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