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Financial Risk Management and Financial Instruments - Summary of Notional Principal of the Foreign Currency Exchange Contracts by Hedged Line Item in Statement of Operations (Details) - Cash Flow Hedges - Foreign Exchange Forwards
€ in Millions, £ in Millions, kr in Millions, kr in Millions, $ in Millions, $ in Millions, $ in Millions
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
AUD ($)
Dec. 31, 2020
GBP (£)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
NOK (kr)
Dec. 31, 2020
SEK (kr)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
AUD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
NOK (kr)
Dec. 31, 2019
SEK (kr)
Dec. 31, 2019
USD ($)
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]                            
Notional amount in foreign currency € 1,695 $ 473 £ 653 $ 405 kr 1,352 kr 2,322 $ 56 € 1,538 $ 402 £ 570 $ 335 kr 1,238 kr 2,053 $ 67
Revenue                            
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]                            
Notional amount in foreign currency   274 379 239 809 1,384 32   226 328 194 739 1,221 38
Cost of Revenue                            
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]                            
Notional amount in foreign currency   $ 199 £ 274 $ 166 kr 543 kr 938 $ 24   $ 176 £ 242 $ 141 kr 499 kr 832 $ 29