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Investments - Investments - ACL on Mortgages (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loans with modifications	1	0	1	0
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	$ (48)	$ (41)	$ (51)	$ (36)
Current period provision	0	5	(3)	10
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (4)	$ 0	$ (4)	$ 0
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	1.00%		1.00%
Commercial Loan [Member] | Extended Maturity
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Modified in Period, Amount	$ 9		$ 9

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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