FAIR VALUE MEASUREMENTS - Fair Value Measurement Inputs and Valuation Techniques (Detail) $ in Millions		Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		$ 73,290	$ 75,741
Equity securities		1,088	1,091
Assets, fair value		80,325	82,924
Level 3
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		1,781	1,778
Equity securities		248	209
Assets, fair value		2,029	1,987
Adjustd cost | Level 3 | Private Financials
Fair Value Measurement Inputs and Valuation Technique
Equity securities		248	209
Mortgage- and asset-backed securities
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		3,086	2,146
Mortgage- and asset-backed securities | Level 3
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		772	343
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		$ 772	$ 343
Mortgage- and asset-backed securities | Lower Limit | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[1]	84.81	97.38
Mortgage- and asset-backed securities | Upper Limit | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[1]	105.89	106.71
Mortgage- and asset-backed securities | Weighted Average | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input		99.39	102.98
Public utilities
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		$ 7,592	$ 7,666
Public utilities | Level 3
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		253	497
Public utilities | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		$ 253
Public utilities | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities			$ 497
Public utilities | Lower Limit | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[1]	94.34
Public utilities | Lower Limit | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[2]		0.0128
Public utilities | Upper Limit | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[1]	102.99
Public utilities | Upper Limit | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[2]		0.0286
Public utilities | Weighted Average | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input		96.46
Public utilities | Weighted Average | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input			0.0192
Sovereign and supranational
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		$ 537	$ 834
Sovereign and supranational | Level 3
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		30	37
Sovereign and supranational | Consensus pricing valuation technique | Level 3 | Offered Quote
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		30	37
Banks/financial institutions
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		8,835	9,299
Banks/financial institutions | Level 3
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		78	159
Banks/financial institutions | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		78	$ 159
Banks/financial institutions | Lower Limit | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[2]		0.0067
Banks/financial institutions | Upper Limit | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[2]		0.0188
Banks/financial institutions | Weighted Average | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input			0.0113
Other corporate
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		28,342	$ 28,362
Other corporate | Level 3
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		648	742
Other corporate | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Available for sale, fixed maturity securities		$ 648	$ 742
Other corporate | Lower Limit | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[2]	0.0069	0.0066
Other corporate | Upper Limit | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input	[2]	0.0423	0.0647
Other corporate | Weighted Average | Discounted cash flow technique | Level 3 | Credit Spread
Fair Value Measurement Inputs and Valuation Technique
Debt securities, available-for-sale, measurement input		0.0206	0.0191

[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.