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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	$ 42,793	$ 42,793		$ 39,818
Fixed maturities, at fair value using the fair value option ("FVO Securities")	263	263		327
Equity securities, at fair value [1]	634	634		864
Derivative assets	31	31		(1)
Short-term investments	3,964	3,964		3,850
Total assets accounted for at fair value on a recurring basis	47,685	47,685		44,858
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(19)	(19)		8
Total liabilities accounted for at fair value on a recurring basis	(19)	$ (19)		8
Equity Security, FV-NI, Contractual Sale Restriction, Nature of Restriction and Circumstance for Lapse		Level 3 includes investments that have contractual sales restrictions that require consent to sell and are in place for the duration that the securities are held by the Company.
Credit derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	30	$ 30		(10)
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(30)	(30)		10
Interest rate derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	1	1
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(6)	(6)		(6)
Equity
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	5	5
Foreign exchange derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets				9
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	12	12		4
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	6	6		18
Fixed maturities, at fair value using the fair value option ("FVO Securities")	0	0		0
Equity securities, at fair value [1]	345	345		333
Derivative assets	0	0		0
Short-term investments	910	910		1,400
Total assets accounted for at fair value on a recurring basis	1,261	1,261		1,751
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0		0
Total liabilities accounted for at fair value on a recurring basis	0	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Credit derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0	0		0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0	0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets				0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0		0
Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	39,972	39,972		37,563
Fixed maturities, at fair value using the fair value option ("FVO Securities")	111	111		160
Equity securities, at fair value [1]	212	212		473
Derivative assets	31	31		(1)
Short-term investments	3,045	3,045		2,425
Total assets accounted for at fair value on a recurring basis	43,371	43,371		40,620
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(24)	(24)		8
Total liabilities accounted for at fair value on a recurring basis	(24)	(24)		8
Significant Observable Inputs (Level 2) | Credit derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	30	30		(10)
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(30)	(30)		10
Significant Observable Inputs (Level 2) | Interest rate derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	1	1
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(6)	(6)		(6)
Significant Observable Inputs (Level 2) | Equity
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0
Significant Observable Inputs (Level 2) | Foreign exchange derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets				9
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	12	12		4
Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	2,815	2,815		2,237
Fixed maturities, at fair value using the fair value option ("FVO Securities")	152	152		167
Equity securities, at fair value [1]	77	77		58
Derivative assets	0	0		0
Short-term investments	9	9		25
Total assets accounted for at fair value on a recurring basis	3,053	3,053		2,487
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	5	5		0
Total liabilities accounted for at fair value on a recurring basis	5	5		0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member]
Liabilities accounted for at fair value on a recurring basis
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	5	5	$ 0	0
Realized/unrealized gain/loss included in net income, liabilities	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Purchases	5	5
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements	0	0
Sales	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3	0	0
Significant Unobservable Inputs (Level 3) | Credit derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0	0		0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0		0
Significant Unobservable Inputs (Level 3) | Interest rate derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0	0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0		0
Significant Unobservable Inputs (Level 3) | Equity
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	5	5
Significant Unobservable Inputs (Level 3) | Equity | Fair Value, Recurring [Member]
Liabilities accounted for at fair value on a recurring basis
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	5	5	$ 0	0
Realized/unrealized gain/loss included in net income, liabilities	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Purchases	5	5
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements	0	0
Sales	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3	0	0
Significant Unobservable Inputs (Level 3) | Foreign exchange derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets				0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0		0
Fair Value Measured at Net Asset Value Per Share [Member]
Liabilities accounted for at fair value on a recurring basis
Deposit Assets	60	60		75
Asset-backed securities ("ABS")
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	3,512	3,512		3,320
Asset-backed securities ("ABS") | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
Asset-backed securities ("ABS") | Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	3,464	3,464		3,320
Asset-backed securities ("ABS") | Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	48	48		0
Collateralized Loan Obligations [Member]
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	3,563	3,563		3,090
Fixed maturities, at fair value using the fair value option ("FVO Securities")	152	152		167
Collateralized Loan Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
Collateralized Loan Obligations [Member] | Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	3,314	3,314		2,977
Collateralized Loan Obligations [Member] | Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	249	249		113
Collateralized Loan Obligations [Member] | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member]
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	79	79		98
CMBS
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	2,857	2,857		3,125
CMBS | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
CMBS | Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	2,651	2,651		2,898
CMBS | Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	206	206		227
CMBS | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member]
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	204	204		226
Corporate
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	20,558	20,558		17,866
Corporate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
Corporate | Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	18,301	18,301		16,005
Corporate | Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	2,257	2,257		1,861
Corporate | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member]
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	2,141	2,141		1,741
Foreign government/government agencies
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	541	541		562
Foreign government/government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
Foreign government/government agencies | Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	541	541		562
Foreign government/government agencies | Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
Municipal
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	5,654	5,654		6,039
Municipal | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
Municipal | Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	5,654	5,654		6,039
Municipal | Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
RMBS
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	5,123	5,123		4,287
RMBS | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	0	0		0
RMBS | Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	5,068	5,068		4,251
RMBS | Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	55	55		36
RMBS | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member]
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	50	50		36
U.S. Treasuries
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	985	985		1,529
U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	6	6		18
U.S. Treasuries | Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	979	979		1,511
U.S. Treasuries | Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Debt Securities, Available-for-sale	$ 0	$ 0		$ 0

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Fair value portion of asset recognized for present right to economic benefit.

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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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