Fair Value - Composition of Investment Portfolio by Major Security Type (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	$ 84,375	$ 75,947	$ 68,222
Equity securities	4,235	4,303	4,134
Investments, fair value	88,610	80,250	72,356
Fair value	6,294	6,173	6,166
Nonredeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	500	728	838
Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,735	3,575	3,296
Common equities \| Common Stocks, excluding Other Risk
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,703	3,550	3,272
Common equities \| Other risk investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	32	25	24
Total fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	82,272	75,332	67,489
Total fixed maturities \| U.S. government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	46,810	45,988	40,894
Total fixed maturities \| State and local government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	2,964	2,778	2,202
Total fixed maturities \| Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	17	16	16
Total fixed maturities \| Corporate and other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	18,122	13,954	13,146
Total fixed maturities \| Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	2,660	1,601	976
Total fixed maturities \| Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	5,049	4,352	3,970
Total fixed maturities \| Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	6,650	6,643	6,285
Total fixed maturities \| Debt Securities \| U.S. government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	46,810	45,988	40,894
Total fixed maturities \| Debt Securities \| State and local government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	2,964	2,778	2,202
Total fixed maturities \| Debt Securities \| Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	17	16	16
Total fixed maturities \| Debt Securities \| Corporate and other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	18,122	13,954	13,146
Total fixed maturities \| Asset-backed Securities \| Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	2,660	1,601	976
Total fixed maturities \| Asset-backed Securities \| Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	5,049	4,352	3,970
Total fixed maturities \| Asset-backed Securities \| Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	6,650	6,643	6,285
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	2,103	615	733
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	48,732	46,601	41,627
Equity securities	3,694	3,527	3,250
Investments, fair value	52,426	50,128	44,877
Fair value	0	0	0
Fair Value, Inputs, Level 1 \| Nonredeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0	0
Fair Value, Inputs, Level 1 \| Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,694	3,527	3,250
Fair Value, Inputs, Level 1 \| Common equities \| Common Stocks, excluding Other Risk
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	3,694	3,527	3,250
Fair Value, Inputs, Level 1 \| Common equities \| Other risk investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0	0
Fair Value, Inputs, Level 1 \| Total fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	46,810	45,988	40,894
Fair Value, Inputs, Level 1 \| Total fixed maturities \| Debt Securities \| U.S. government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	46,810	45,988	40,894
Fair Value, Inputs, Level 1 \| Total fixed maturities \| Debt Securities \| State and local government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 1 \| Total fixed maturities \| Debt Securities \| Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 1 \| Total fixed maturities \| Debt Securities \| Corporate and other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 1 \| Total fixed maturities \| Asset-backed Securities \| Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 1 \| Total fixed maturities \| Asset-backed Securities \| Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 1 \| Total fixed maturities \| Asset-backed Securities \| Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 1 \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	1,922	613	733
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	35,638	29,341	26,592
Equity securities	440	676	786
Investments, fair value	36,078	30,017	27,378
Fair value	6,294	6,173	6,166
Fair Value, Inputs, Level 2 \| Nonredeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	440	676	786
Fair Value, Inputs, Level 2 \| Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0	0
Fair Value, Inputs, Level 2 \| Common equities \| Common Stocks, excluding Other Risk
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0	0
Fair Value, Inputs, Level 2 \| Common equities \| Other risk investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0	0
Fair Value, Inputs, Level 2 \| Total fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	35,457	29,339	26,592
Fair Value, Inputs, Level 2 \| Total fixed maturities \| Debt Securities \| U.S. government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 2 \| Total fixed maturities \| Debt Securities \| State and local government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	2,964	2,778	2,202
Fair Value, Inputs, Level 2 \| Total fixed maturities \| Debt Securities \| Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	17	16	16
Fair Value, Inputs, Level 2 \| Total fixed maturities \| Debt Securities \| Corporate and other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	18,117	13,949	13,143
Fair Value, Inputs, Level 2 \| Total fixed maturities \| Asset-backed Securities \| Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	2,660	1,601	976
Fair Value, Inputs, Level 2 \| Total fixed maturities \| Asset-backed Securities \| Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	5,049	4,352	3,970
Fair Value, Inputs, Level 2 \| Total fixed maturities \| Asset-backed Securities \| Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	6,650	6,643	6,285
Fair Value, Inputs, Level 2 \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	181	2	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	5	5	3
Equity securities	101	100	98
Investments, fair value	106	105	101
Fair value	0	0	0
Fair Value, Inputs, Level 3 \| Nonredeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	60	52	52
Fair Value, Inputs, Level 3 \| Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	41	48	46
Fair Value, Inputs, Level 3 \| Common equities \| Common Stocks, excluding Other Risk
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	9	23	22
Fair Value, Inputs, Level 3 \| Common equities \| Other risk investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	32	25	24
Fair Value, Inputs, Level 3 \| Total fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	5	5	3
Fair Value, Inputs, Level 3 \| Total fixed maturities \| Debt Securities \| U.S. government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 3 \| Total fixed maturities \| Debt Securities \| State and local government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 3 \| Total fixed maturities \| Debt Securities \| Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 3 \| Total fixed maturities \| Debt Securities \| Corporate and other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	5	5	3
Fair Value, Inputs, Level 3 \| Total fixed maturities \| Asset-backed Securities \| Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 3 \| Total fixed maturities \| Asset-backed Securities \| Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 3 \| Total fixed maturities \| Asset-backed Securities \| Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Fair Value, Inputs, Level 3 \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	0	0	0
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	84,475	77,741	70,401
Equity securities	1,292	1,501	1,595
Investments, fair value	85,767	79,242	71,996
Long-term debt	6,895	6,893	6,891
Carrying (Reported) Amount, Fair Value Disclosure \| Nonredeemable preferred stocks
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	517	756	887
Carrying (Reported) Amount, Fair Value Disclosure \| Common equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	775	745	708
Carrying (Reported) Amount, Fair Value Disclosure \| Common equities \| Common Stocks, excluding Other Risk
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	743	720	684
Carrying (Reported) Amount, Fair Value Disclosure \| Common equities \| Other risk investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	32	25	24
Carrying (Reported) Amount, Fair Value Disclosure \| Total fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	82,372	77,126	69,668
Carrying (Reported) Amount, Fair Value Disclosure \| Total fixed maturities \| Debt Securities \| U.S. government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	46,684	47,103	42,063
Carrying (Reported) Amount, Fair Value Disclosure \| Total fixed maturities \| Debt Securities \| State and local government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	3,030	2,893	2,345
Carrying (Reported) Amount, Fair Value Disclosure \| Total fixed maturities \| Debt Securities \| Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	17	16	17
Carrying (Reported) Amount, Fair Value Disclosure \| Total fixed maturities \| Debt Securities \| Corporate and other debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	18,004	14,111	13,439
Carrying (Reported) Amount, Fair Value Disclosure \| Total fixed maturities \| Asset-backed Securities \| Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	2,644	1,600	981
Carrying (Reported) Amount, Fair Value Disclosure \| Total fixed maturities \| Asset-backed Securities \| Commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	5,325	4,721	4,457
Carrying (Reported) Amount, Fair Value Disclosure \| Total fixed maturities \| Asset-backed Securities \| Other asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	6,668	6,682	6,366
Carrying (Reported) Amount, Fair Value Disclosure \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	$ 2,103	$ 615	$ 733

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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