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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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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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 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

Trading Securities Change In Gross Gain Loss

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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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	12 Months Ended
Investments (Narrative) (Details) $ in Millions	Dec. 31, 2022 USD ($) security loan item	Dec. 31, 2021 USD ($) loan security item	Dec. 31, 2020 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
Investments [Line Items]
Increase (decrease) in gross AFS securities unrealized losses	$ (12,600)
Trading Securities Change In Gross Gain Loss	$ (632)	$ (51)	$ 118
Mortgage Loans in Process of Foreclosure, Amount		$ 15
Number of partnerships in alternative investment portfolio \| item	337	311
Alternative investments as a percentage of overall invested assets		2.00%
Amortized cost	$ 111,707	$ 105,142		$ 111,058	$ 109,592	$ 107,587	$ 107,459	$ 106,668	$ 105,866
Fair Value	99,736	$ 118,711		$ 97,572	$ 103,317	$ 110,663	$ 122,085	$ 122,215	$ 117,313
Fair value of collateral received that we are permitted to sell or re-pledge	25
Investment commitments	2,400
Investment commitments for limited partnerships	1,900
Investment commitments for mortgage loans on real estate	226
Investment commitments for private placements	$ 310,000
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	$ 3,700
Fair value of portfolio rated below investment grade	3,500	$ 3,800
Mortgage Loans [Member] \| Federal Home Loan Mortgage Corporation [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 720	$ 953
Concentration risk, percentage	1.00%	1.00%
Mortgage Loans [Member] \| Federal National Mortgage Association [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 745	$ 926
Concentration risk, percentage	1.00%	1.00%
Securities Investment [Member] \| Consumer Non-Cyclical Industry [Member] \| Investments [Member]
Investments [Line Items]
Fair value	$ 15,100	$ 19,600
Concentration risk, percentage	11.00%	13.00%
Securities Investment [Member] \| Financial Service [Member]
Investments [Line Items]
Fair value	$ 16,600	$ 19,200
Securities Investment [Member] \| Financial Service [Member] \| Investments [Member]
Investments [Line Items]
Concentration risk, percentage	13.00%	12.00%
Commercial [Member]
Investments [Line Items]
Number of impaired loans \| security	2	4
Impaired financing receivable, principal balance	$ 1	$ 1
Commercial [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| California [Member]
Investments [Line Items]
Concentration risk, percentage	27.00%	26.00%
Commercial [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| Texas [Member]
Investments [Line Items]
Concentration risk, percentage		9.00%
Residential [Member]
Investments [Line Items]
Number of loans past due \| loan	73	65
Number of impaired loans \| security	37	50
Impaired financing receivable, principal balance	$ 16	$ 22
Number Of Loans In Foreclosure \| loan	49	34
Mortgage Loans in Process of Foreclosure, Amount	$ 21
Residential [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| California [Member]
Investments [Line Items]
Concentration risk, percentage	17.00%	22.00%
Residential [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| New Jersey [Member]
Investments [Line Items]
Concentration risk, percentage	12.00%
Residential [Member] \| Geographic Concentration Risk [Member] \| Mortgage Loans On Real Estate [Member] \| Florida [Member]
Investments [Line Items]
Concentration risk, percentage		14.00%