Fair Value of Financial Instruments Amounts in Paragraphs - Fair Value of Financial Instruments (Details 2) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Marketable Securities [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	$ 50
Marketable Security, Unrealized Gain (Loss)			$ 45
Investment with IPO [Member]
Marketable Securities [Line Items]
Equity Security, FV-NI, Contractual Sale Restriction, Nature of Restriction and Circumstance for Lapse		The company is prohibited from selling this investment until the first quarter of 2026.
Equity Securities, FV-NI		$ 68	68
Foreign Exchange Forward [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount		308	308	$ 399
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount		$ 167	$ 167	$ 273