Financial Instruments and Fair Value Measures - Summary of Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) € in Millions, $ in Millions	Jun. 30, 2025 USD ($)	Jun. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 EUR (€)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	$ 973		$ 928
Designated as hedging \| Interest rate swaps
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts \| €		€ 675			€ 200
Fair value measurements recurring \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	3,688		2,913
Fair value, assets	18		104
Fair value, liabilities	211		11
Fair value measurements recurring \| Level 2 \| Designated as hedging
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	3,235		1,846
Fair value, assets	17		86
Fair value, liabilities	202		6
Fair value measurements recurring \| Level 2 \| Designated as hedging \| Forward currency exchange contracts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	520		331
Fair value, assets	15		4
Fair value, liabilities	13		6
Fair value measurements recurring \| Level 2 \| Designated as hedging \| Cross-currency interest rate swaps
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	2,040		1,515
Fair value, assets	2		82
Fair value, liabilities	173		0
Fair value measurements recurring \| Level 2 \| Designated as hedging \| Interest rate swaps
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	675		0
Fair value, assets	0		0
Fair value, liabilities	16		0
Fair value measurements recurring \| Level 2 \| Undesignated as hedging
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	453		1,067
Fair value, assets	1		18
Fair value, liabilities	9		5
Fair value measurements recurring \| Level 2 \| Undesignated as hedging \| Forward currency exchange contracts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	453		597
Fair value, assets	1		9
Fair value, liabilities	9		2
Fair value measurements recurring \| Level 2 \| Undesignated as hedging \| Interest rate swaps
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Notional Amounts	0		470	€ 450
Fair value, assets	0		9
Fair value, liabilities	$ 0		$ 3