Derivative instruments - Fair Value of Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives Fair Value [Line Items]
Derivative assets	$ 225	$ 145
Derivative liabilities	1,072	1,092
Derivatives designated as hedging instrument
Derivatives Fair Value [Line Items]
Derivative assets	225	145
Derivative liabilities	1,072	1,092
Derivatives designated as hedging instrument | Foreign currency forward contracts | Other Current Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative assets	225	145
Derivatives designated as hedging instrument | Foreign currency forward contracts | Accrued Liabilities Other Non Current Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	43	116
Derivatives designated as hedging instrument | Cross-currency swap contracts | Other Current Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative assets	0	0
Derivatives designated as hedging instrument | Cross-currency swap contracts | Accrued Liabilities Other Non Current Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	429	405
Derivatives designated as hedging instrument | Interest rate swap contracts | Other Current Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative assets	0	0
Derivatives designated as hedging instrument | Interest rate swap contracts | Accrued Liabilities Other Non Current Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	600	571
Derivatives designated as hedging instrument | Forward interest rate contracts | Other Current Noncurrent Assets
Derivatives Fair Value [Line Items]
Derivative assets	0	0
Derivatives designated as hedging instrument | Forward interest rate contracts | Accrued Liabilities Other Non Current Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	$ 0	$ 0