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Investments - Mortgage Loans- ACL (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans (net of ACL of $38 and $—)		$ 0
Retained Earnings (Accumulated Deficit)	$ 13,918	12,685
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans (net of ACL of $38 and $—)				$ (19)
Retained Earnings (Accumulated Deficit)				12,667
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans (net of ACL of $38 and $—)	(38)	0	$ (1)		$ (1)
Financing Receivable, Credit Loss, Expense (Reversal)	19	$ 1	$ 0
Commercial Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained Earnings (Accumulated Deficit)	$ 19
Commercial Loan [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans (net of ACL of $38 and $—)				$ (19)

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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