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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Financing receivable, Number of loans past due

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Impaired financing receivable, number of impaired loans

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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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No definition available.

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Investments [Line Items]

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No definition available.

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Number Of Loans In Foreclosure

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No definition available.

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- Definition

Number of partnerships represented in alternative investment portfolio.

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No definition available.

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- Definition

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

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- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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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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Investments (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
Investments (Narrative) (Details) $ in Millions	Mar. 31, 2023 USD ($) loan security item	Dec. 31, 2022 USD ($) security loan item	Dec. 31, 2021
Investments [Line Items]
Increase (decrease) in gross AFS securities unrealized losses	$ 1,900.0
Number of partnerships in alternative investment portfolio \| item	330	337
Alternative investments as a percentage of overall invested assets	2.00%	2.00%
Amortized cost	$ 111,528.0	$ 111,707.0
Fair Value	101,936.0	$ 99,736.0
Fair value of collateral received that we are permitted to sell or re-pledge	26.0
Investment commitments	2,500.0
Investment commitments for limited partnerships	1,800.0
Investment commitments for mortgage loans on real estate	277.0
Investment commitments for private placements	$ 405.0
Minimum [Member]
Investments [Line Items]
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements	80.00%
Maximum [Member]
Investments [Line Items]
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements	95.00%
Corporate Bonds [Member]
Investments [Line Items]
Percentage of fair value rated as investment grade	96.00%	96.00%
Amortized cost of portfolio rated below investment grade	$ 3,500.0	$ 3,700.0
Fair value of portfolio rated below investment grade	3,300.0	3,500.0
Federal National Mortgage Association [Member] \| Consumer Non-Cyclical Industry [Member] \| Investments [Member]
Investments [Line Items]
Fair value	15,400.0	15,100.0
Concentration risk, percentage			11.00%
Federal National Mortgage Association [Member] \| Financial Service [Member]
Investments [Line Items]
Fair value	$ 16,700.0	16.6
Federal National Mortgage Association [Member] \| Financial Service [Member] \| Investments [Member]
Investments [Line Items]
Concentration risk, percentage	12.00%		13.00%
Securities Investment [Member] \| Federal Home Loan Mortgage Corporation [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 745.0	$ 720.0
Concentration risk, percentage	1.00%	1.00%
Securities Investment [Member] \| White Chapel Llc [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 780.0	$ 716.0
Commercial [Member]
Investments [Line Items]
Number of impaired loans \| security	3	2
Impaired financing receivable, principal balance	$ 1.0	$ 1.0
Commercial [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| California [Member]
Investments [Line Items]
Concentration risk, percentage	28.00%	27.00%
Commercial [Member] \| Federal National Mortgage Association [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| Texas [Member]
Investments [Line Items]
Concentration risk, percentage	9.00%	9.00%
Residential [Member]
Investments [Line Items]
Number of loans past due \| loan	74	73
Number of impaired loans \| loan	47	37
Impaired financing receivable, principal balance	$ 19.0	$ 16.0
Number Of Loans In Foreclosure \| loan	36	49
Mortgage Loans in Process of Foreclosure, Amount	$ 15.0	$ 21.0
Residential [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| California [Member]
Investments [Line Items]
Concentration risk, percentage	16.00%	17.00%
Residential [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| Texas [Member]
Investments [Line Items]
Concentration risk, percentage	12.00%	12.00%