FAIR VALUE MEASUREMENTS - Fair Value Measurement Inputs and Valuation Techniques (Detail) $ in Millions		Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		$ 65,269	$ 73,290
Equity securities		796	1,088
Total assets		74,133	80,325
Level 3
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		2,067	1,781
Equity securities		157	248
Total assets		2,224	2,029
Adjustd cost | Level 3 | Private financials
Fair Value Measurement Inputs and Valuation Technique
Equity securities		157	248
Mortgage- and asset-backed securities
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		3,563	3,086
Mortgage- and asset-backed securities | Level 3
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		1,156	772
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		$ 1,156	$ 772
Mortgage- and asset-backed securities | Lower Limit | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[1]	84.08	84.81
Mortgage- and asset-backed securities | Upper Limit | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[1]	104.60	105.89
Mortgage- and asset-backed securities | Weighted Average | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[1]	99.07	99.39
Public utilities
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		$ 7,045	$ 7,592
Public utilities | Level 3
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		647	253
Public utilities | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale			$ 253
Public utilities | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		$ 647
Public utilities | Lower Limit | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[1]		94.34
Public utilities | Lower Limit | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[2]	0.0100
Public utilities | Upper Limit | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[1]		102.99
Public utilities | Upper Limit | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[2]	0.0375
Public utilities | Weighted Average | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[1]		96.46
Public utilities | Weighted Average | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[2]	0.0162
Sovereign and supranational
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		$ 416	$ 537
Sovereign and supranational | Level 3
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		23	30
Sovereign and supranational | Consensus pricing valuation technique | Level 3 | Offered quotes
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		23	30
Banks/financial institutions
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		8,956	8,835
Banks/financial institutions | Level 3
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		10	78
Banks/financial institutions | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale			78
Banks/financial institutions | Adjustd cost | Level 3 | Private financials
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		10
Other corporate
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		25,409	28,342
Other corporate | Level 3
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		231	648
Other corporate | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale		$ 231	$ 648
Other corporate | Lower Limit | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[2]	0.0091	0.0069
Other corporate | Upper Limit | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[2]	0.0294	0.0423
Other corporate | Weighted Average | Discounted cash flow technique | Level 3 | Credit spreads
Fair Value Measurement Inputs and Valuation Technique
Fixed maturity securities, available-for-sale, measurement input	[2]	0.0173	0.0206

[1] Represents prices for securities where the Company receives unadjusted broker quotes and for which there is no transparency into the providers' valuation techniques.

[2] Actual or equivalent credit spreads in basis points.