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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross		$ 17,171
Allowance for credit losses	$ (77)	(96)	$ (184)	$ (204)
Unamortized premium (discount)	22	16
Mark-to-market gains (losses)	(6)	(3)
Total carrying value	17,892	17,991
Current [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	17,789	18,004
30 to 59 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	113	36
60 to 89 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	25	5
90 Or More Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	26	29
Commercial [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	16,870
Allowance for credit losses	(59)	(79)	(172)	(187)
Unamortized premium (discount)	(10)	(11)
Mark-to-market gains (losses)	(6)	(3)
Total carrying value	16,805	17,089
Commercial [Member] | Current [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	16,774	17,167
Commercial [Member] | 30 to 59 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	90	15
Commercial [Member] | 60 to 89 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	16
Residential [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	1,105	919
Allowance for credit losses	(18)	(17)	$ (12)	$ (17)
Unamortized premium (discount)	32	27
Total carrying value	1,087	902
Residential [Member] | Current [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	1,015	837
Residential [Member] | 30 to 59 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	23	21
Residential [Member] | 60 to 89 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	9	5
Residential [Member] | 90 Or More Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	$ 26	$ 29

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The amount of premium (net of discount) that was originally recognized at the issuance of the mortgage loan that has yet to be amortized.

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This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount, before allowance for credit loss, of financing receivable.

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