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Reinsurance - Narrative (Details)			9 Months Ended		12 Months Ended
Reinsurance - Narrative (Details)	Jan. 04, 2021 USD ($)	Oct. 01, 1998 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) affiliate	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Effects of Reinsurance [Line Items]
Indemnity coinsurance and modified coinsurance arrangements					$ 3,500,000,000
Reinsurance Recoverable, Guaranteed Benefits					2,500,000,000
Ceded Premiums Written					2,400,000,000
Policyholder Benefits and Claims Incurred, Ceded	$ (2,500,000,000)				(2,629,000,000)	$ (46,000,000)	$ (44,000,000)
Transfer from Investments					3,700,000,000
Realized capital gains (losses)			$ (310,000,000)	$ (144,000,000)	166,000,000	(310,000,000)	$ (144,000,000)
Reinsurance Payable	73,000,000				3,000,000	0
Deposit receivable	1,500,000,000
Proceeds from disposal of life insurance business		$ 1,000,000,000
Premiums receivable and reinsurance recoverable					$ 3,601,000,000	1,219,000,000
Security Life of Denver International Limited and Langhorne I, LLC
Effects of Reinsurance [Line Items]
Reinsurance treaties, number of affiliates \| affiliate					1
Lincoln National Corporation, Subsidiary
Effects of Reinsurance [Line Items]
Premiums receivable and reinsurance recoverable					$ 1,100,000,000	$ 1,200,000,000
SLD, SLDI, RRII, MUL and VAE
Effects of Reinsurance [Line Items]
Realized capital gains (losses)	$ 500,000,000
SLD \| Discontinued Operations, Held-for-sale \| RLI and VRIAC
Effects of Reinsurance [Line Items]
Disposal Group, Including Discontinued Operation, Reinsurance Agreement, Reinsurance Quota Share, Percent	100.00%
SLD \| Discontinued Operations, Held-for-sale \| RLNY
Effects of Reinsurance [Line Items]
Disposal Group, Including Discontinued Operation, Reinsurance Agreement, Reinsurance Quota Share, Percent	75.00%