Fair Value Measurements, Valuation Techniques - Nonrecurring Basis (Details) - Nonrecurring [Member] $ in Millions	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities	$ 3,432	$ 2,792
Fair value, inputs, level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities	$ 2,780	$ 1,791
Equity securities, FV-NI, valuation technique [Extensible Enumeration]	Valuation, Market Approach [Member]	Valuation, Market Approach [Member]
Fair value, inputs, level 3 [Member] \| Measurement input, multiples [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities	$ 1,214	$ 1,398
Fair value, inputs, level 3 [Member] \| Measurement input, multiples [Member] \| Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities, measurement input	1.1	1.1
Fair value, inputs, level 3 [Member] \| Measurement input, multiples [Member] \| Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities, measurement input	28.0	44.1
Fair value, inputs, level 3 [Member] \| Measurement input, multiples [Member] \| Weighted average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities, measurement input	7.6	12.3
Fair value, inputs, level 3 [Member] \| Measurement input, market comparability adjustment [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities	$ 1,566	$ 393
Fair value, inputs, level 3 [Member] \| Measurement input, market comparability adjustment [Member] \| Minimum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities, measurement input	(1.000)	(1.000)
Fair value, inputs, level 3 [Member] \| Measurement input, market comparability adjustment [Member] \| Maximum [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities, measurement input	(0.150)	(0.049)
Fair value, inputs, level 3 [Member] \| Measurement input, market comparability adjustment [Member] \| Weighted average [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Equity securities, measurement input	(0.599)	(0.491)

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) and investment in equity security without readily determinable fair value.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-3

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- Definition

Indicates valuation technique for measuring investment in equity security at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), and without readily determinable fair value.

+ References

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