Alternative investments as a percentage of overall invested assets.

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Amortized cost of portfolio rated below investment grade.

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No definition available.

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This item represents the change in gross unrealized holding gain or loss on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

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No definition available.

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Percentage of the fair value of portfolio that was rated investment grade as of balance sheet date.

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No definition available.

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Fair value of portfolio rated below investment grade.

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No definition available.

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This item represents total investment commitments as of the balance sheet date for fixed maturity available-for-sale securities, limited partnerships, real estate and mortgage loans on real estate.

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No definition available.

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This item represents investment commitments as of the balance sheet date for limited partnerships.

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No definition available.

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This item represents investment commitments as of the balance sheet date for private placements.

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This item represents investment commitments as of the balance sheet date for mortgage loans.

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Investments [Line Items]

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No definition available.

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Number of partnerships represented in alternative investment portfolio.

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No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Fair value of investment subject to concentration of credit or market risk or both.

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Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

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Fair value of the collateral, or portion thereof, that has been re-pledged, delivered, or otherwise used.

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Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

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Investments - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
Investments - Narrative (Details) $ in Millions	Mar. 31, 2025 USD ($) investment	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) investment
Investments [Line Items]
Decrease in gross AFS securities unrealized losses	$ 742
Percentage of fair value rated as investment grade	96.00%		96.00%
Losses from loan modifications	$ 5	$ 0
Number of partnerships in alternative investment portfolio \| investment	370		371
Alternative investments as a percentage of overall invested assets	3.00%		3.00%
Investment commitments	$ 4,600
Investment commitments for limited partnerships	3,500
Investment commitments for mortgage loans on real estate	828
Investment commitments for private placements	277
Derivative Counterparties
Investments [Line Items]
Fair value of collateral received that we are permitted to sell or re-pledge	2,200
Fair value of securities received as collateral that have been resold or repledged	64
Corporate bonds
Investments [Line Items]
Amortized cost of portfolio rated below investment grade	2,800		$ 2,900
Fair value of portfolio rated below investment grade	2,700		2,800
Fannie Mae \| MBS
Investments [Line Items]
Fair value, concentration of risk, investments	$ 892		$ 851
Fannie Mae \| Investments \| Lender Concentration Risk \| MBS
Investments [Line Items]
Concentration risk	1.00%		1.00%
Federal Home Loan Mortgage Corporation \| MBS
Investments [Line Items]
Fair value, concentration of risk, investments	$ 604		$ 566
Federal Home Loan Mortgage Corporation \| Investments \| Lender Concentration Risk \| MBS
Investments [Line Items]
Concentration risk	1.00%		1.00%
Financial Service \| Securities Investment
Investments [Line Items]
Fair value, concentration of risk, investments	$ 13,500		$ 13,400
Financial Service \| Investments \| Lender Concentration Risk \| Securities Investment
Investments [Line Items]
Concentration risk	10.00%		10.00%
Consumer Non-Cyclical Industry \| Securities Investment
Investments [Line Items]
Fair value, concentration of risk, investments	$ 13,000		$ 12,900
Consumer Non-Cyclical Industry \| Investments \| Lender Concentration Risk \| Securities Investment
Investments [Line Items]
Concentration risk			10.00%