Debt (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) financialInstitution lineOfCredit	Dec. 31, 2021 USD ($)	Sep. 01, 2020 USD ($)
Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 200,000,000
Line of Credit
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	800,000,000
Maximum incremental increase	200,000,000
Amount outstanding	0	$ 0
Line of Credit | Subsidiaries
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 315,000,000
Number of uncommitted lines of credit | lineOfCredit	5
Number of financial institutions offering lines of credit | financialInstitution	5
Number of financial institutions with stated limits | lineOfCredit	4
Commercial Paper
Short-term Debt [Line Items]
Weighted average interest rates on average daily borrowings	0.20%	0.20%
Short-term debt	$ 0	$ 0
Short-term debt, average outstanding amount	$ 257,000,000	$ 157,000,000
Uncommited Lines of Credit
Short-term Debt [Line Items]
Weighted average interest rates	0.80%	0.90%
Short-term debt	$ 0	$ 0
Short-term debt, average outstanding amount	2,900,000	$ 47,000,000
Line of Credit | Revolving Credit Facility
Short-term Debt [Line Items]
Weighted average interest rates		1.10%
Average daily borrowings		$ 13,300,000
EQH
Short-term Debt [Line Items]
Amount outstanding	$ 850,000,000	$ 755,000,000
Weighted average interest rates	0.30%	0.20%
Average daily borrowings	$ 645,400,000	$ 404,600,000
Weighted average interest rates on average daily borrowings	0.20%
EQH | Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 900,000,000
EQH Uncommitted Facility | Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity			$ 300,000,000
Amount outstanding	$ 0	$ 0