INVESTMENTS - Middle Market Loans by Key Credit Quality Indicators (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total Financing Receivable	$ 12,801	$ 13,688
Middle market loans
Financing Receivable, Credit Quality Indicator [Line Items]
2023	106
2022	591
2021	1,182
2020	694
2019	724
Prior	529
Revolving Loans	851
Total Financing Receivable	4,677
Gross writeoffs, 2023	0
Gross writeoffs, 2022	0
Gross writeoffs, 2021	0
Gross writeoffs, 2020	0
Gross writeoffs, 2019	0
Gross writeoffs, Prior	0
Gross writeoffs, Revolving	0
Gross writeoffs, Total	0
Middle market loans | BBB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	7
2022	45
2021	142
2020	68
2019	38
Prior	45
Revolving Loans	120
Total Financing Receivable	465
Middle market loans | BB Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	35
2022	313
2021	413
2020	253
2019	176
Prior	104
Revolving Loans	398
Total Financing Receivable	1,692
Middle market loans | B Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	64
2022	213
2021	601
2020	322
2019	432
Prior	230
Revolving Loans	275
Total Financing Receivable	2,137
Middle market loans | CCC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	20
2021	26
2020	51
2019	78
Prior	128
Revolving Loans	39
Total Financing Receivable	342
Middle market loans | CC Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	10
Revolving Loans	0
Total Financing Receivable	10
Middle market loans | C and Lower Credit Rating
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	12
Revolving Loans	19
Total Financing Receivable	$ 31