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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		$ 36		$ 36		$ 37
Recorded Investment		36		36		37
Related Allowance		0		0		0
Carrying Value		36		36		37
Average Investment	[1]	36	$ 27	36	$ 22
Interest Income		0	0	1	0
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		17		17		0
Recorded Investment		17		17		0
Related Allowance		0		0		0
Carrying Value		17		17		0
Average Investment		9	0	4	0
Interest Income		0	0	0	0
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		19		19		37
Recorded Investment		19		19		37
Related Allowance		0		0		0
Carrying Value		19		19		$ 37
Average Investment	[1]	27	27	32	22
Interest Income		$ 0	$ 0	$ 1	$ 0
[1] (1)Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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