INVESTMENTS - Nonaccrual Loans (Detail) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		$ 12,801	$ 13,688
Total, nonaccrual status		718
Total, 90 days or more past due and still accruing		0
Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		6,114
Total, nonaccrual status		633
Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		1,709
Total, nonaccrual status		0
Middle market loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		4,677
Total, nonaccrual status		85
Other loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		301
Total, nonaccrual status		0
Current
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		12,050
Current | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		5,481
Current | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		1,676
Current | Middle market loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		4,592
Current | Other loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		301
Less Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		141
Less Than 90 Days Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		108
Less Than 90 Days Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		33
Less Than 90 Days Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		0
Less Than 90 Days Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		0
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross	[1]	610
90 Days or More Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross	[1]	525
90 Days or More Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross	[1]	0
90 Days or More Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross	[1]	85
90 Days or More Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross	[1]	0
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		751
Financial Asset, Past Due | Transitional real estate loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		633
Financial Asset, Past Due | Commercial mortgage loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		33
Financial Asset, Past Due | Middle market loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		85
Financial Asset, Past Due | Other loans
Financing Receivable, Past Due [Line Items]
Commercial mortgage and other loans, gross		$ 0

[1] As of December 31, 2023, there were no loans that were 90 days or more past due that continued to accrue interest.