INVESTMENTS - Middle Market Loans by Key Credit Quality Indicators (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Credit Ratings:
Total	$ 10,559	$ 11,224
Middle market loans
Credit Ratings:
2025	499
2024	681
2023	116
2022	658
2021	881
Prior	1,432
Revolving Loans	120
Total	4,387	$ 4,423
Current-period gross writeoffs:
2025	0
2024	0
2023	0
2022	2
2021	23
Prior	44
Revolving Loans	0
Total	69
Middle market loans | BBB Credit Rating
Credit Ratings:
2025	39
2024	47
2023	32
2022	0
2021	58
Prior	107
Revolving Loans	9
Total	292
Middle market loans | BB Credit Rating
Credit Ratings:
2025	322
2024	428
2023	37
2022	349
2021	326
Prior	619
Revolving Loans	61
Total	2,142
Middle market loans | B Credit Rating
Credit Ratings:
2025	112
2024	204
2023	47
2022	286
2021	405
Prior	412
Revolving Loans	26
Total	1,492
Middle market loans | CCC Credit Rating
Credit Ratings:
2025	26
2024	2
2023	0
2022	9
2021	75
Prior	195
Revolving Loans	14
Total	321
Middle market loans | CC Credit Rating
Credit Ratings:
2025	0
2024	0
2023	0
2022	14
2021	0
Prior	16
Revolving Loans	5
Total	35
Middle market loans | C and Lower Credit Rating
Credit Ratings:
2025	0
2024	0
2023	0
2022	0
2021	17
Prior	83
Revolving Loans	5
Total	$ 105