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Investments (Summary of Allowance for Credit Losses on AFS Investments) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Ending balance | $ 0
Accounting Standards Update 2016-13 [Member] |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Beginning Balance | 0
Additions not previously recorded | 3
Additions arising from PCD Assets | 0
Reductions from Securities Sold | 0
Reductions – Intent to sell or MLTN | 3
Change in Allowance Previously Recorded | 0
Write- Offs | 0
Recoveries | 0
Ending balance | 0
Corporate Obligations [Member] |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Ending balance | 0
Corporate Obligations [Member] | Accounting Standards Update 2016-13 [Member] |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Beginning Balance | 0
Additions not previously recorded | 3
Additions arising from PCD Assets | 0
Reductions from Securities Sold | 0
Reductions – Intent to sell or MLTN | 3
Change in Allowance Previously Recorded | 0
Write- Offs | 0
Recoveries | 0
Ending balance | $ 0

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