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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Document Period End Date	Mar. 31, 2021
Recorded investment	$ 6,058	$ 5,861
Valuation Allowances:
Allowance for Loan and Lease Losses, Real Estate	47	64	$ 39	$ 12
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Evaluated individually for credit losses	36	37
Evaluated collectively for credit losses	6,022	5,824
Recorded investment	6,058	5,861
Valuation Allowances:
Specific for credit losses	0	0
Non-specifically identified credit losses	47	64
Allowance for Loan and Lease Losses, Real Estate	$ 47	$ 64

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

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