Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Transaction Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investments [Abstract]
Sales	$ 69	$ 116	$ (313)	$ (85)
Credit losses	(23)	(12)	(103)	(143)
Valuation change of equity investments	200	119	253	207
Valuation change and settlements of derivatives	6	20	(78)	(3)
Net gains (losses) on investments and derivatives	$ 252	$ 243	$ (241)	$ (24)