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Derivative instruments - Fair Value of Derivatives Included in the Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivatives Fair Value [Line Items]    
Derivative assets $ 347 $ 341
Derivative liabilities 1,314 1,398
Forward interest rate contracts    
Derivatives Fair Value [Line Items]    
Derivative liabilities 0 5
Derivatives designated as hedging instrument    
Derivatives Fair Value [Line Items]    
Derivative assets 347 341
Derivative liabilities 1,314 1,398
Derivatives designated as hedging instrument | Foreign currency forward contracts    
Derivatives Fair Value [Line Items]    
Derivative assets 347 287
Derivative liabilities 29 76
Derivatives designated as hedging instrument | Cross-currency swap contracts    
Derivatives Fair Value [Line Items]    
Derivative assets 0 54
Derivative liabilities 513 541
Derivatives designated as hedging instrument | Interest rate swap contracts    
Derivatives Fair Value [Line Items]    
Derivative assets 0 0
Derivative liabilities 772 776
Derivatives designated as hedging instrument | Forward interest rate contracts    
Derivatives Fair Value [Line Items]    
Derivative assets 0 0
Derivatives designated as hedging instrument | Forward interest rate contracts    
Derivatives Fair Value [Line Items]    
Derivative liabilities $ 0 $ 5