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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020		Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		$ 36			$ 37
Recorded Investment		36			37
Related Allowance		0			0
Carrying Value		36			37
Average Investment	[1]	36	$ 17
Interest Income		0	0
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		0			0
Recorded Investment		0			0
Related Allowance		0			0
Carrying Value		0			0
Average Investment		0	0	[1]
Interest Income		0	0
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		36			37
Recorded Investment		36			37
Related Allowance		0			0
Carrying Value		36			$ 37
Average Investment		36	17	[1]
Interest Income		$ 0	$ 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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