INVESTMENTS - Middle Market Loans by Key Credit Quality Indicators (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Loan-to-Value Ratio:
Total	$ 11,024	$ 11,224
Middle market loans
Loan-to-Value Ratio:
2025	95
2024	686
2023	125
2022	687
2021	993
Prior	1,703
Revolving Loans	162
Total	4,451	$ 4,423
Current-period gross writeoffs:
2025	0
2024	0
2023	0
2022	0
2021	11
Prior	3
Revolving Loans	0
Total	14
Middle market loans | BBB Credit Rating
Loan-to-Value Ratio:
2025	0
2024	30
2023	29
2022	0
2021	78
Prior	108
Revolving Loans	12
Total	257
Middle market loans | BB Credit Rating
Loan-to-Value Ratio:
2025	61
2024	425
2023	43
2022	426
2021	374
Prior	607
Revolving Loans	76
Total	2,012
Middle market loans | B Credit Rating
Loan-to-Value Ratio:
2025	34
2024	226
2023	53
2022	234
2021	480
Prior	662
Revolving Loans	46
Total	1,735
Middle market loans | CCC Credit Rating
Loan-to-Value Ratio:
2025	0
2024	5
2023	0
2022	14
2021	61
Prior	223
Revolving Loans	19
Total	322
Middle market loans | CC Credit Rating
Loan-to-Value Ratio:
2025	0
2024	0
2023	0
2022	13
2021	0
Prior	16
Revolving Loans	5
Total	34
Middle market loans | C and Lower Credit Rating
Loan-to-Value Ratio:
2025	0
2024	0
2023	0
2022	0
2021	0
Prior	87
Revolving Loans	4
Total	$ 91