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Investments - Investments - ACL on Mortgages (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	Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained earnings	$ 15,169		$ 15,169		$ 13,918
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	(24)	$ (43)	(38)	$ 0
Financing Receivable, Allowance for Credit Loss	(26)	(38)	(26)	(38)	$ (38)
Current period provision	2	(5)	(12)	19
Ending balance	$ (26)	$ (38)	$ (26)	$ (38)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Loan [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained earnings						$ 19
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss						$ (19)

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

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