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Debt - Senior Credit Facilities Narrative (Details) ¥ in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2025 USD ($) | Oct. 29, 2025 USD ($) | Feb. 12, 2025 | Nov. 30, 2024 USD ($) | Jan. 31, 2023 CNY (¥) | Mar. 31, 2022 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 CNY (¥) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 CNY (¥) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Aug. 11, 2025 USD ($) | Mar. 06, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥) | Jun. 30, 2024 CNY (¥) | Apr. 30, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |
Proceeds from short-term borrowings |  |  |  |  |  |  |  |  | $ 606 |  | $ 160 |  |  |  |  |  |  |
Repayments of Short-term Debt |  |  |  |  |  |  |  |  | 555 |  | 418 |  |  |  |  |  |  |
Proceeds from Issuance of Long-Term Debt |  |  |  |  |  |  |  |  | 2,926 |  | 299 |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  | 3,060 |  | $ 1,019 |  |  |  |  |  |  |
5 Year Delayed-Draw Term Loan | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-Term Debt |  |  |  |  |  |  |  |  | $ 330 |  |  |  |  |  |  |  |  |
5 Year Delayed-Draw Term Loan | Term Loan Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt | $ 50 | $ 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
January 2023 CSIT One Year Working Capital Term Loan | January 2023 CSIT One Year Working Capital Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  | ¥ 800 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | ¥ |  |  |  |  |  |  |  | ¥ 800 |  |  |  |  |  |  |  |  |  |
January 2023 CSIT One Year Working Capital Term Loan | January 2023 CSIT One Year Working Capital Term Loan | Variable Interbank Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
June 2024 CNC Three Year Working Capital Loan | June 2024 CNC Three Year Working Capital Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 800 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |
Proceeds from Issuance of Long-Term Debt | ¥ |  |  |  |  |  |  |  |  |  | ¥ 720 |  |  |  |  |  |  |  |
Secured Debt | Amended restated receivable purchasing facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value of sales receivables |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |
Transfer of financial assets accounted for as sales, amount derecognized |  |  |  |  |  |  |  |  | $ 1,200 |  |  | $ 1,500 |  |  |  |  |  |
Proceeds collected on accounts receivable sold under factoring facilities |  |  |  |  |  |  |  |  | 1,200 |  |  | 1,500 |  |  |  |  |  |
Trade Receivables Pledged As Collateral |  |  |  |  |  |  |  |  | $ 78 |  |  |  |  |  |  |  |  |
Europe Factoring Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of financial assets accounted for as sales, non-recourse basis, account receivable percentage |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Japan Factoring Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of financial assets accounted for as sales, non-recourse basis, account receivable percentage |  |  |  |  |  |  |  |  | 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% |  |  |  |  |  |  |  |  |
China Factoring Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of financial assets accounted for as sales, non-recourse basis, account receivable percentage |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
China, Europe, Japan and Singapore Factoring Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of financial assets accounted for as sales, amount derecognized |  |  |  |  |  |  |  |  | $ 546 |  |  | 700 |  |  |  |  |  |
Proceeds collected on accounts receivable sold under factoring facilities |  |  |  |  |  |  |  |  | 533 |  |  | 640 |  |  |  |  |  |
Master Discounting Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer of financial assets accounted for as sales, amount derecognized |  |  |  |  |  |  |  |  | 53 |  |  | $ 100 |  |  |  |  |  |
November 2024 US Term Loan | Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from short-term borrowings |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |
Repayments of Short-term Debt |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |
November 2024 US Term Loan | Term Loan Facility | Minimum | Term SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 1.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2024 US Term Loan | Term Loan Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2024 US Term Loan | Term Loan Facility | Maximum | Term SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2024 US Term Loan | Term Loan Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 2025 CNC Three Year Working Capital Loan | March 2025 CNC Three Year Working Capital Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 750 |  |  |  |
Proceeds from Issuance of Long-Term Debt | ¥ |  |  |  |  |  |  |  |  |  | ¥ 560 |  |  |  |  |  |  |  |
U.S. Credit Agreements | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Credit Agreements | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Various senior notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 2024 CNC Three Year Working Capital Loan | December 2024 CNC Three Year Working Capital Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,000 |  |  |
Proceeds from Issuance of Long-Term Debt | ¥ |  |  |  |  |  |  |  |  |  | ¥ 872 |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,750 |  |  |  |  |
Available for borrowing |  |  |  |  |  |  |  |  | $ 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% | 1.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  | 0.00% | 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% | 2.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | China Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | ¥ |  |  |  |  | ¥ 1,750 |  |  |  |  |  |  |  |  |  | ¥ 550 |  | ¥ 750 |
Available for borrowing |  |  |  |  |  |  |  |  | $ 54 |  |  |  |  |  |  |  |  |
December 2023 CNC Three Year Working Capital Loan | December 2023 CNC Three Year Working Capital Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 800
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.80%

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