Debt - Narrative (Details) € in Millions, ¥ in Millions, $ in Millions					1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 16, 2026 CNY (¥)	Aug. 05, 2026 USD ($)	Jun. 25, 2026 USD ($)	Apr. 30, 2025 CNY (¥)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2026 CNY (¥)	Aug. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 EUR (€)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 EUR (€)	Nov. 30, 2024 USD ($)	Mar. 31, 2022 USD ($)
Debt Instrument [Line Items]
Refinancing expense						$ 0	$ 0	$ 0	$ 32
Repayments of long-term debt								$ 1,089	3,060
Debt Instrument, Redemption Price, Percentage								100.00%
March 2022 U.S. Term Loan Credit Agreement
Debt Instrument [Line Items]
Senior unsecured debt																		$ 1,000
November 2024 US Term Loan
Debt Instrument [Line Items]
Senior unsecured debt																	$ 1,000
Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity												$ 1,750
Revolving Credit Facility | Revolving Credit Facility | Minimum | Variable Interbank Interest Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate								1.00%
Revolving Credit Facility | Revolving Credit Facility | Minimum | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate								0.00%
Revolving Credit Facility | Revolving Credit Facility | Maximum | Variable Interbank Interest Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate								2.00%
Revolving Credit Facility | Revolving Credit Facility | Maximum | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate								1.00%
CNCC Revolving Credit Agreement | China Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | ¥					¥ 100
Debt instrument, term					12 months
CNCC CNY950M Term Loan Agreement | China Credit Facilities
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | ¥	[1]										¥ 950
Debt Instrument, Interest Rate, Stated Percentage						2.41%		2.41%			2.41%
5.000% Senior Notes due 2031
Debt Instrument [Line Items]
Senior unsecured debt						$ 852		$ 852		$ 881
Debt instrument, face amount | €																€ 750
Debt Instrument, Interest Rate, Stated Percentage						5.00%		5.00%			5.00%
March 2025 Offering of USD Senior Unsecured Notes
Debt Instrument [Line Items]
Debt instrument, face amount															$ 1,800
4.777% Senior Notes due 2026
Debt Instrument [Line Items]
Senior unsecured debt	[2]					$ 0		$ 0		526
Debt Instrument, Repurchased Face Amount | €														€ 552
Interest Expense, Debt				$ 25
Repayments of long-term debt				$ 508
Debt Instrument, Redemption Price, Percentage				100.00%
Debt Instrument, Interest Rate, Stated Percentage				4.777%		5.277%		5.277%			5.277%
Senior unsecured notes due 2027, interest rate of 7.165%(1)
Debt Instrument [Line Items]
Senior unsecured debt	[2]					$ 554		$ 554		554
Debt Instrument, Repurchased Face Amount													$ 500
Debt Instrument, Interest Rate, Stated Percentage						7.165%		7.165%			7.165%
March 2025 Offering of Senior Unsecured Notes
Debt Instrument [Line Items]
Debt Issuance Costs, Gross													$ 34
March 2025 Tender Offers
Debt Instrument [Line Items]
Refinancing expense									$ 32
December 2025 Offering of Senior Unsecured Notes
Debt Instrument [Line Items]
Debt instrument, face amount										1,400
December 2025 Tender Offers
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount										1,200
Secured Debt | Amended restated receivable purchasing facility
Debt Instrument [Line Items]
Percentage of fair value of sales receivables								100.00%
Transfer of financial assets accounted for as sales, amount derecognized						$ 1,142		$ 1,142		1,471
Proceeds collected on accounts receivable sold under factoring facilities								1,100		1,500
Trade Receivables Pledged As Collateral						104		$ 104
Secured Debt | European Receivables Purchase and Financing Facility
Debt Instrument [Line Items]
Percentage of fair value of sales receivables								100.00%
Transfer of financial assets accounted for as sales, amount derecognized						652		$ 652		0
Proceeds collected on accounts receivable sold under factoring facilities								371		0
Trade Receivables Pledged As Collateral						$ 267		$ 267
Japan Factoring Agreements
Debt Instrument [Line Items]
Transfer of financial assets accounted for as sales, non-recourse basis, account receivable percentage						100.00%		100.00%			100.00%
Singapore Factoring Agreements
Debt Instrument [Line Items]
Transfer of financial assets accounted for as sales, non-recourse basis, account receivable percentage						90.00%		90.00%			90.00%
China Factoring Agreements
Debt Instrument [Line Items]
Transfer of financial assets accounted for as sales, non-recourse basis, account receivable percentage						100.00%		100.00%			100.00%
China, Europe, Japan and Singapore Factoring Agreements
Debt Instrument [Line Items]
Transfer of financial assets accounted for as sales, amount derecognized						$ 529		$ 529		717
Proceeds collected on accounts receivable sold under factoring facilities								589		724
Master Discounting Agreement
Debt Instrument [Line Items]
Transfer of financial assets accounted for as sales, amount derecognized						65		65		82
Senior unsecured notes due 2026, interest rate of 1.400%
Debt Instrument [Line Items]
Senior unsecured debt						$ 0		$ 0		$ 400
Interest Expense, Debt			$ 3
Repayments of long-term debt			$ 400
Debt Instrument, Interest Rate, Stated Percentage			1.40%			1.40%		1.40%			1.40%
CNCC Sept 2026 CNY1B Working Capital Loan Agreement | China Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | ¥		¥ 1,000
Debt instrument, term		3 years

[1] Senior unsecured working capital loan bearing interest at certain floating interest rates.

[2] In February 2025, Moody's Ratings downgraded the Company's credit rating, which had the effect of increasing interest rates by 25 basis points on certain senior unsecured notes, effective on various dates beginning May 15, 2025 through January 19, 2026. In November 2025, S&P Global Ratings and Moody's Ratings downgraded the Company's credit rating, which together had the effect of increasing interest rates for certain senior unsecured notes by an additional 50 basis points, effective on various dates beginning January 15, 2026 through May 15, 2026.