Alternative investments as a percentage of overall invested assets.

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- Definition

Amortized cost of portfolio rated below investment grade.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Fair value of portfolio rated below investment grade.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Investment Commitments, Asset-Backed Variable Interest Entities

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

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No definition available.

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- Definition

Investments [Line Items]

+ References

No definition available.

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- Definition

Number of partnerships represented in alternative investment portfolio.

+ References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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- Definition

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		9 Months Ended		12 Months Ended
Investments - Narrative (Details) $ in Millions	Sep. 30, 2025 USD ($) investment	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) investment	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) investment
Investments [Line Items]
Decrease in gross AFS securities unrealized losses			$ 2,000
Percentage of fair value rated as investment grade	96.00%		96.00%		96.00%
Losses from loan modifications	$ 3	$ 1	$ 21	$ 3
Number of partnerships in alternative investment portfolio \| investment	381		381		371
Alternative investments as a percentage of overall invested assets			3.00%		3.00%
Investment commitments	$ 5,900		$ 5,900
Investment commitments for limited partnerships	3,600		3,600
Investment commitments for asset-backed VIEs	600		600
Investment commitments for mortgage loans on real estate	1,400		1,400
Investment commitments for private placements	353		353
Derivative Counterparties
Investments [Line Items]
Fair value of collateral received that we are permitted to sell or re-pledge	1,600		1,600
Fair value of securities received as collateral that have been resold or repledged	593		593
Corporate bonds
Investments [Line Items]
Amortized cost of portfolio rated below investment grade	3,000		3,000		$ 2,900
Fair value of portfolio rated below investment grade	2,800		2,800		2,800
Fannie Mae \| MBS
Investments [Line Items]
Fair value, concentration of risk, investments	966		$ 966		$ 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	668		$ 668		$ 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	13,800		$ 13,800		$ 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	$ 13,100		$ 13,100		$ 12,900
Consumer Non-Cyclical Industry \| Investments \| Lender Concentration Risk \| Securities Investment
Investments [Line Items]
Concentration risk					10.00%