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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross			$ 16,235
Allowance for credit losses	$ (131)	$ (170)	(204)	$ (202)	$ (273)	$ (2)
Unamortized premium (discount)	11		8
Mark-to-market gains (losses)	(3)		(5)
Total carrying value	17,730		16,763
Current [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	17,802		16,855
30 to 59 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	15		32
60 to 89 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	3		8
90 Or More Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	33		69
Commercial [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	17,099
Allowance for credit losses	(115)	(156)	(187)	(172)	(236)
Unamortized premium (discount)	(12)		(14)
Mark-to-market gains (losses)	(3)		(5)
Total carrying value	16,981		16,043
Commercial [Member] | Current [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	17,111		16,245
Commercial [Member] | 30 to 59 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross			4
Residential [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	765		737
Allowance for credit losses	(16)	$ (14)	(17)	$ (30)	$ (37)	$ (2)
Unamortized premium (discount)	23		22
Total carrying value	749		720
Residential [Member] | Current [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	691		610
Residential [Member] | 30 to 59 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	15		28
Residential [Member] | 60 to 89 Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	3		8
Residential [Member] | 90 Or More Days Past Due [Member]
Mortgage Loans On Real Estate Aging [Abstract]
Mortgage loans on real estate, gross	$ 33		$ 69

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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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