Other Insurance Liabilities and Separate Accounts - Roll Forward of Separate Accounts (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Separate Account, Liability [Roll Forward]
Separate Accounts liability, beginning of the period	$ 3,250	$ 3,228
Premiums and deposits	964	860
Surrenders and withdrawals	(277)	(9)
Benefit payments	(978)	(938)
Investment earnings	348	100
Net transfers from general account	13	7
Other	(9)	2
Separate Accounts liability, end of the period	3,311	3,250
Cash surrender value, end of the period	$ 1,987	$ 2,181

Amount of cash outflow to separate account policyholder from benefit payment.

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Amount of separate account liability payable to policyholder upon surrender of contract before maturity.

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Amount of increase (decrease) in separate account liability from performance of investment.

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Amount increase (decrease) in separate account liability from change, classified as other.

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Amount of cash inflow to separate account liability from premium and deposit from cash received.

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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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No definition available.

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Amount of decrease in separate account liability from contract redemption and withdrawal of funds.

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Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.

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Amount of transfer to (from) liability for policyholder account balance (to) from liability for separate account.

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