Derivatives - Balance Sheet Location (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2021
Location and Fair Value Amount of Derivative Instruments
Derivative assets, fair value	$ 145,000,000	$ 142,000,000
Derivative liability, fair value	338,000,000	165,000,000
Interest rate contracts
Location and Fair Value Amount of Derivative Instruments
Gross notional Amount	400,000,000		$ 800,000,000
Derivatives designated as hedging instruments
Location and Fair Value Amount of Derivative Instruments
Derivative assets, fair value	142,000,000	139,000,000
Derivative liability, fair value	322,000,000	152,000,000
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other current assets
Location and Fair Value Amount of Derivative Instruments
Gross notional Amount	1,858,000,000	1,382,000,000
Derivative assets, fair value	19,000,000	61,000,000
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Derivative liability, fair value	32,000,000	6,000,000
Derivatives designated as hedging instruments | Foreign currency forward/option contracts and cross-currency swaps | Other assets
Location and Fair Value Amount of Derivative Instruments
Gross notional Amount	6,206,000,000	4,746,000,000
Derivative assets, fair value	123,000,000	78,000,000
Derivatives designated as hedging instruments | Foreign currency forward/option contracts and cross-currency swaps | Other liabilities
Location and Fair Value Amount of Derivative Instruments
Derivative liability, fair value	267,000,000	65,000,000
Derivatives designated as hedging instruments | Interest rate contracts | Other assets
Location and Fair Value Amount of Derivative Instruments
Gross notional Amount	400,000,000	800,000,000
Derivative assets, fair value	0	0
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities
Location and Fair Value Amount of Derivative Instruments
Derivative liability, fair value	23,000,000	81,000,000
Derivatives not designated as hedging instruments
Location and Fair Value Amount of Derivative Instruments
Derivative assets, fair value	3,000,000	3,000,000
Derivative liability, fair value	16,000,000	13,000,000
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other current assets
Location and Fair Value Amount of Derivative Instruments
Gross notional Amount	2,416,000,000	2,217,000,000
Derivative assets, fair value	3,000,000	3,000,000
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other assets
Location and Fair Value Amount of Derivative Instruments
Gross notional Amount	1,000,000	0
Derivative assets, fair value	0	0
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Derivative liability, fair value	16,000,000	13,000,000
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other liabilities
Location and Fair Value Amount of Derivative Instruments
Derivative liability, fair value	$ 0	$ 0