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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This item represents the percentage of the fair value of securities obtained as collateral under reverse repurchase agreements

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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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Financing Receivable, Number Of Loans In Foreclosure

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No definition available.

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Financing Receivable, Number Of Loans Past Due

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Gain (Loss) On Modification Of Financing Receivable

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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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No definition available.

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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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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 30
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- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Investments - Narrative (Details)	3 Months Ended		12 Months Ended
Investments - Narrative (Details)	Mar. 31, 2024 USD ($) loan investment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) loan investment
Investments [Line Items]
Increase in gross AFS securities unrealized losses	$ 814,000,000
Percentage of fair value rated as investment grade	96.00%		96.00%
Mortgage loans in process of foreclosure	$ 35,000,000		$ 38,000,000
Losses from loan modifications	$ 0	$ 0
Number of partnerships in alternative investment portfolio \| investment	358		352
Alternative investments as a percentage of overall invested assets	3.00%		3.00%
Fair value of collateral received that we are permitted to sell or re-pledge	$ 25,000,000
Fixed maturity available-for-sale securities, at fair value	87,764,000,000		$ 88,738,000,000
Investment commitments	3,800,000,000
Investment commitments for limited partnerships	2,900,000,000
Investment commitments for mortgage loans on real estate	748,000,000
Investment commitments for private placements	199,000,000
Asset Pledged as Collateral
Investments [Line Items]
Fixed maturity available-for-sale securities, at fair value	52,000,000
Derivative Counterparties
Investments [Line Items]
Fair value of collateral received that we are permitted to sell or re-pledge	1,700,000,000
Fair value of securities received as collateral that have been resold or repledged	$ 527,000,000
Minimum
Investments [Line Items]
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements	80.00%
Maximum
Investments [Line Items]
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements	95.00%
Residential mortgage loans on real estate
Investments [Line Items]
Number of loans past due \| loan	118		116
Number of loans in foreclosure \| loan	82		82
California \| Mortgages \| Geographic Concentration Risk \| Commercial
Investments [Line Items]
Concentration risk	26.00%		27.00%
California \| Mortgages \| Geographic Concentration Risk \| Residential mortgage loans on real estate
Investments [Line Items]
Concentration risk	14.00%		14.00%
Texas \| Mortgages \| Geographic Concentration Risk \| Commercial
Investments [Line Items]
Concentration risk	10.00%		9.00%
New York \| Mortgages \| Geographic Concentration Risk \| Residential mortgage loans on real estate
Investments [Line Items]
Concentration risk	12.00%		12.00%
Corporate bonds
Investments [Line Items]
Amortized cost of portfolio rated below investment grade	$ 2,800,000,000		$ 3,000,000,000
Fair value of portfolio rated below investment grade	2,700,000,000		2,800,000,000
Fannie Mae \| MBS
Investments [Line Items]
Fair value, concentration of risk, investments	$ 741,000,000		$ 739,000,000
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	$ 567,000,000		$ 570,000,000
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	$ 13,700,000,000		$ 14,000,000,000
Financial Service \| Investments \| Lender Concentration Risk \| Securities Investment
Investments [Line Items]
Concentration risk			11.00%
Consumer Non-Cyclical Industry \| Securities Investment
Investments [Line Items]
Fair value, concentration of risk, investments	$ 13,500,000,000		$ 13,800,000,000
Consumer Non-Cyclical Industry \| Investments \| Lender Concentration Risk \| Securities Investment
Investments [Line Items]
Concentration risk	11.00%