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Investments (Credit Quality Indicators For Residential Mortgage Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Mortgage Loans Credit Quality [Line Items]
Mortgage loans on real estate, ACL	$ 204	$ 2
Residential [Member]
Mortgage Loans Credit Quality [Line Items]
Amortized Cost	$ 737	$ 735
Percent of total	100.00%	100.00%
Mortgage loans on real estate, ACL	$ 17	$ 2
Performing [Member] | Residential [Member]
Mortgage Loans Credit Quality [Line Items]
Amortized Cost	$ 666	$ 718
Percent of total	90.40%	97.70%
Nonperforming [Member] | Residential [Member]
Mortgage Loans Credit Quality [Line Items]
Amortized Cost	$ 71	$ 17
Percent of total	9.60%	2.30%

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Reflects the percentage derived from dividing mortgage loans with a specified loan-to-value ratio by total principal amount of mortgage loans.

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- Definition

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

+ References

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

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