Debt (Senior Credit Facilities Narrative) (Details) ¥ in Millions, $ in Millions					1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 11, 2025 USD ($)	Feb. 06, 2025 USD ($)	Nov. 01, 2024 USD ($)	Mar. 31, 2022 USD ($)	Jan. 31, 2023 CNY (¥)	Mar. 31, 2024 CNY (¥)	Dec. 31, 2024	Dec. 19, 2024 CNY (¥)	Dec. 10, 2024 CNY (¥)	Jun. 28, 2024 CNY (¥)	Apr. 07, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)	Mar. 31, 2023 USD ($)
5 Year Delayed-Draw Term Loan | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Term				5 years
Debt Instrument, Face Amount | $				$ 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 | Subsequent Event [Member]
Debt Instrument [Line Items]
Proceeds from Lines of Credit | $		$ 300
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 | Maximum | Variable Interbank Interest Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							2.00%
China Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					¥ 1,750
China Revolving Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								¥ 550			¥ 750
China Working Capital Term Loan | China Working Capital Term Loan
Debt Instrument [Line Items]
Debt Instrument, Term					12 months
Debt Instrument, Face Amount					¥ 800
Repayments of Debt						¥ 800
China Working Capital Term Loan | Variable Interbank Interest Rate | China Working Capital Term Loan
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					0.50%
Bank Loan due 2026 | CNC Working Capital Loan
Debt Instrument [Line Items]
Debt Instrument, Face Amount												¥ 800
Interest Rate												2.80%
CNC Three Year Working Capital Loan | CNC Three Year Working Capital Loan
Debt Instrument [Line Items]
Debt Instrument, Face Amount										¥ 800
Interest Rate										2.75%
November 2024 US Term Loan Credit Agreement | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Term			364 days
Debt Instrument, Face Amount | $			$ 1,000
November 2024 US Term Loan Credit Agreement | Minimum | Term SOFR | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.30%
November 2024 US Term Loan Credit Agreement | Minimum | Base Rate | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.30%
November 2024 US Term Loan Credit Agreement | Maximum | Term SOFR | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.25%
November 2024 US Term Loan Credit Agreement | Maximum | Base Rate | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.25%
CNC December 2024 Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Face Amount									¥ 1,000
Senior unsecured notes due 2025, interest rate of 1.250%
Debt Instrument [Line Items]
Interest Rate							1.25%
Senior unsecured notes due 2025, interest rate of 1.250% | Subsequent Event [Member]
Debt Instrument [Line Items]
Repayments of Debt | $	$ 300