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Investments (Summary of Allowance for Credit Losses on AFS Investments) (Detail) - Accounting Standards Update 2016-13 [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Beginning Balance | $ 3 | $ 0
Additions not previously recorded | 0 | 3
Additions arising from PCD Assets | 0 | 0
Reductions from Securities Sold | 0 | 0
Reductions – Intent to sell or MLTN | 3 | 3
Change in Allowance Previously Recorded | 0 | 0
Write- Offs | 0 | 0
Recoveries | 0 | 0
Ending balance | 0 | 0
Corporate Obligations [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Beginning Balance | 3 | 0
Additions not previously recorded | 0 | 3
Additions arising from PCD Assets | 0 | 0
Reductions from Securities Sold | 0 | 0
Reductions – Intent to sell or MLTN | 3 | 3
Change in Allowance Previously Recorded | 0 | 0
Write- Offs | 0 | 0
Recoveries | 0 | 0
Ending balance | $ 0 | $ 0

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- Definition Amount of allowance for credit loss 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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