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Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2019
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Mortgage loans on real estate		$ 7,377	$ 6,590
Policy loans		1,206	1,231
Funds withheld at interest		5,683	6,003
Cash and cash equivalents		2,970	2,927	$ 2,948	$ 3,408
Short-term investments		222	154
Other invested assets		1,171	1,140
Accrued investment income		759	630
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Interest-sensitive contract liabilities		30,273	30,342
Funds Held under Reinsurance Agreements, Liability		4,483	1,486
Carrying Value [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Mortgage loans on real estate	[1]	7,377	6,590
Policy loans	[1]	1,206	1,231
Funds withheld at interest	[1]	6,005	6,319
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures		71	49
Cash and cash equivalents	[1]	1,635	1,392
Short-term investments	[1]	35	33
Other invested assets	[1]	1,019	947
Accrued investment income	[1]	759	630
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Interest-sensitive contract liabilities	[1]	21,797	23,493
Funds Held under Reinsurance Agreements, Liability		4,689	1,848
Long And Short Term Debt	[1]	4,427	3,961
Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Mortgage loans on real estate		6,975	6,109
Policy loans		1,206	1,231
Funds withheld at interest		5,547	5,884
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures		73	52
Cash and cash equivalents		1,635	1,392
Short-term investments		35	33
Other invested assets		841	758
Accrued investment income		759	630
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Interest-sensitive contract liabilities		21,665	23,065
Funds Held under Reinsurance Agreements, Liability		4,400	1,572
Long And Short Term Debt		4,243	3,670
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Mortgage loans on real estate		0	0
Policy loans		0	0
Funds withheld at interest		0	0
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures		0	0
Cash and cash equivalents		1,635	1,392
Short-term investments		35	33
Other invested assets		4	4
Accrued investment income		0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Interest-sensitive contract liabilities		0	0
Funds Held under Reinsurance Agreements, Liability		0	0
Long And Short Term Debt		0	0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Mortgage loans on real estate		0	0
Policy loans		1,206	1,231
Funds withheld at interest		0	0
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures		0	0
Cash and cash equivalents		0	0
Short-term investments		0	0
Other invested assets		63	65
Accrued investment income		759	630
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Interest-sensitive contract liabilities		0	0
Funds Held under Reinsurance Agreements, Liability		0	0
Long And Short Term Debt		0	0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Mortgage loans on real estate		6,975	6,109
Policy loans		0	0
Funds withheld at interest		5,547	5,884
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures		73	52
Cash and cash equivalents		0	0
Short-term investments		0	0
Other invested assets		774	689
Accrued investment income		0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Interest-sensitive contract liabilities		21,665	23,065
Funds Held under Reinsurance Agreements, Liability		4,400	1,572
Long And Short Term Debt		$ 4,243	$ 3,670
[1] Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of the liability as of the balance sheet date pertaining to the guarantee given by the insurance entity to contract holders of a specified rate of return (a guaranteed yield) on their investments for a specified period.

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Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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