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Investments - Investments - ACL on Mortgages (Details) - Commercial Loan [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | $ (41) | $ (36) | $ (36) | $ (29)
Current period provision | 5 | 0 | 10 | 7
Financing Receivable, Allowance for Credit Loss | $ (46) | $ (36) | $ (46) | $ (36)

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