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Fair Value - Summary of Quantitative Information about Level 3 Fair Value Measurements (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value		$ 94,509	$ 79,400	$ 80,250
Fair Value, Inputs, Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value		108	100	105
Fair Value, Inputs, Level 3 | Total Quantitative Level Three Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value		74	77	80
Fair Value, Inputs, Level 3 | Third Party Pricing Exemption Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value		34	23	25
Fair Value, Inputs, Level 3 | Corporate and other debt securities | Total Quantitative Level Three Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value		$ 5	$ 3	5
Fair value inputs, market cap price change percentage, range, minimum	(1.40%)	(1.00%)	(3.10%)
Fair value inputs, market cap price change percentage, range, maximum	(1.30%)	(0.90%)	10.90%
Fair value inputs, market cap price change percentage, weighted average	(1.40%)	(1.00%)	2.60%
Fair Value, Inputs, Level 3 | Nonredeemable preferred stocks | Total Quantitative Level Three Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value		$ 60	$ 52	52
Fair value inputs, market cap price change percentage, range, minimum	(14.10%)	(6.60%)	4.00%
Fair value inputs, market cap price change percentage, range, maximum	6.00%	11.30%	25.00%
Fair value inputs, market cap price change percentage, weighted average	(2.70%)	3.80%	18.10%
Fair Value, Inputs, Level 3 | Common equities | Total Quantitative Level Three Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value		$ 9	$ 22	$ 23
Fair value inputs, market cap price change percentage, range, minimum	(41.30%)	(21.50%)	(19.10%)
Fair value inputs, market cap price change percentage, range, maximum	95.90%	74.60%	69.60%
Fair value inputs, market cap price change percentage, weighted average	6.00%	11.30%	19.00%

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- Definition

Weighted average market capitalization percentage used to calculate the periodic increase/(decrease) in valuation of Level 3 securities. This value represents the maximum change in the range of valuation changes for the period.

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Weighted average market capitalization percentage used to calculate the periodic increase/(decrease) in valuation of Level 3 securities. This value represents the minimum change in the range of valuation changes for the period.

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Weighted average market capitalization percentage used to calculate the periodic increase/(decrease) in valuation of Level 3 securities. This value represents the weighted average change for the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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