Debt (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) lineOfCredit financialInstitution	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 11, 2021 USD ($)	Sep. 28, 2021 USD ($)	Sep. 01, 2020 USD ($)
Short-term Debt [Line Items]
Proceeds from debt, net	$ 80,000,000	$ 115,000,000	$ 2,105,000
Credit Facility
Short-term Debt [Line Items]
Credit facility, maximum borrowing capacity	800,000,000			$ 50,000,000	$ 100,000,000
Credit facility, possible aggregate incremental limit increase	200,000,000
Amounts outstanding under credit facility	0	0
Proceeds from debt, net	0	$ 0
Short-term debt outstanding	0
Credit Facility | SCB LLC
Short-term Debt [Line Items]
Credit facility, maximum borrowing capacity	$ 165,000,000
Number of uncommitted lines of credit | lineOfCredit	3
Number of financial institutions offering lines of credit | financialInstitution	3
Number of financial institutions with stated limits | lineOfCredit	2
Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rates on average daily borrowings	0.20%	0.40%
Short-term debt outstanding	$ 0	$ 0
Average daily borrowings	$ 157,000,000	$ 83,200,000
Uncommitted Lines of Credit
Short-term Debt [Line Items]
Line of credit facility interest rate	0.90%	1.60%
Short-term debt outstanding	$ 0	$ 0
Average daily borrowings	47,000	900,000
Revolving Credit Facility
Short-term Debt [Line Items]
Credit facility, maximum borrowing capacity	200,000,000
Credit Facility | Revolving Credit Facility
Short-term Debt [Line Items]
Amounts outstanding under credit facility	$ 0	$ 0
Line of credit facility interest rate	1.10%	1.60%
Average daily borrowings	$ 13,300,000	$ 16,500,000
EQH Facility
Short-term Debt [Line Items]
Amounts outstanding under credit facility	$ 755,000,000	$ 675,000,000
Line of credit facility interest rate	0.20%	0.20%
Average daily borrowings	$ 404,600,000	$ 470,800,000
Weighted average interest rates on average daily borrowings	0.20%	0.50%
EQH Facility | Revolving Credit Facility
Short-term Debt [Line Items]
Credit facility, maximum borrowing capacity	$ 900,000,000
EQH Uncommitted Facility | Revolving Credit Facility
Short-term Debt [Line Items]
Credit facility, maximum borrowing capacity						$ 300,000,000
Amounts outstanding under credit facility	0	$ 0
Proceeds from debt, net	$ 0