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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Document Period End Date	Sep. 30, 2021
Mortgage Loans:
Total mortgage loans	$ 6,416	$ 5,861
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]
Mortgage loans on real estate (net of valuation allowances)	6,366	5,787
Commercial Real Estate Portfolio Segment [Member]
Mortgage Loans:
Evaluated individually for credit losses	36	37
Evaluated collectively for credit losses	6,380	5,824
Total mortgage loans	6,416	5,861
Valuation Allowances:
Specific for credit losses	0	0
Non-specifically identified credit losses	39	64
Total valuation allowances	$ 39	$ 64

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