Investments - Allowance for Losses for Commercial Mortgage Loans (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Mar. 31, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Allowance for Loan and Lease Losses [Roll Forward]
Balance as of January 1, 2023	$ 7	$ 48	$ 48
Credit losses on mortgage loans for which credit losses were not previously recorded			6
Increase (decrease) on mortgage loans with allowance recorded in previous period			2
Financing Receivable, Nonaccrual, Number Of Loans \| loan	0
Financing Receivable, Nonaccrual, Interest Income	$ 0
Commercial Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Balance as of January 1, 2023	14	11	$ 11
Credit losses on mortgage loans for which credit losses were not previously recorded	1	2
Increase (decrease) on mortgage loans with allowance recorded in previous period	(1)	1
Premium Receivable, Credit Loss Expense (Reversal)	14	14
Write-offs	0	0
Recoveries of amounts previously written off	$ 0	$ 0
Troubled debt restructuring, number of contracts \| loan	0

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

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Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Number of financing receivables that have been modified by troubled debt restructurings.

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Amount of interest income on financing receivable on nonaccrual status.

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Amount of expense (reversal of expense) for expected credit loss on premium receivable.

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