Fair Value Hierarchy - Investments, Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	$ (3)	$ 14
Investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	79	86
Net unrealized gains/(losses)	(159)	(71)
Investments \| Operating income (loss)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	(156)	(66)
Investments \| Interest income
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	76	81
Investments \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	$ (80)	$ 15

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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