Investments (Credit Quality Indicators For Commercial Mortgage Loans) (Details) - Commercial [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Mortgage Loans Credit Quality [Line Items]
Amortized Cost	$ 17,072	$ 16,152
Loan-to-value ratio, less than 65% [Member]
Mortgage Loans Credit Quality [Line Items]
Amortized Cost	16,048	15,157
Loan-to-value ratio, 65% to 75% [Member]
Mortgage Loans Credit Quality [Line Items]
Amortized Cost	955	948
Loan-to-value ratio, 75% to 100% [Member]
Mortgage Loans Credit Quality [Line Items]
Amortized Cost	$ 69	$ 47

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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