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Fair Value Hierarchy - Investments, Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	$ 2	$ (18)	$ 32	$ (8)
Investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	95	83	246	296
Net unrealized gains/(losses)	88	189	357	(20)
Investments | Operating income (loss)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	104	175	376	(1)
Investments | Interest income
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	79	97	227	277
Investments | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net realized gains/(losses)	$ 183	$ 272	$ 603	$ (276)

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