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Financial Assets and Liabilities - Foreign Exchange Risk (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
DerivativeInstrument
Not designated as hedging instruments - economic hedges | Currency swaps    
Derivatives, Fair Value [Line Items]    
Notional amount $ 120  
Number of derivatives instruments outstanding | DerivativeInstrument   0
Not designated as hedging instruments - economic hedges | Currency swaps | Maximum    
Derivatives, Fair Value [Line Items]    
Term of contract 1 year  
Derivative instruments in cash flow hedges | Foreign exchange contracts    
Derivatives, Fair Value [Line Items]    
Net gains from derivatives $ 3 $ 0
Deferred net loss/ profit on derivatives reclassified to net income $ 3  
Derivative instruments in cash flow hedges | Foreign exchange forward contracts    
Derivatives, Fair Value [Line Items]    
Maximum length of time hedged 1 year  
Weighted average remaining maturity 6 months  
Derivative instruments in cash flow hedges | Designated as hedging instruments | Foreign exchange forward contracts    
Derivatives, Fair Value [Line Items]    
Notional amount $ 227 $ 0