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Debt Obligations - Additional Information (Detail)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Feb. 01, 2021
USD ($)
Jul. 31, 2020
EUR (€)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2015
USD ($)
Debt Instrument [Line Items]              
Revolving credit facility $ 1,150           $ 1,150
Senior notes   $ 25,490       $ 26,496  
Long term debt currency portion USD   60.00%          
Long term debt currency portion EUR   37.00%          
Long term debt currency portion CHF   3.00%          
Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior notes | €       € 1,010      
Debt instrument face amount         $ 700    
Weighted average interest rate       0.375% 2.25%    
Convertible Debt [Member]              
Debt Instrument [Line Items]              
Principal amount currently outstanding on the debt instruments   $ 514 $ 491     $ 514  
Weighted average interest rate   0.25%          
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Covenant Description   The net debt to EBITDA ratio limit was 5.75x through December 31, 2020, gradually declines to 5.50x in the first and second quarters of 2021, 5.00x in the third and fourth quarters of 2021, and continues to gradually decline over the remaining term of the RCF.          
Long Term Debt Payable Under Revolving Credit Facility   $ 0          
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,300          
Revolving Credit Facility [Member] | Trache A [Member] | Trache A Extension [Member]              
Debt Instrument [Line Items]              
Revolving credit facility $ 1,065            
Line of credit facility, expiration date Apr. 08, 2023            
Revolving Credit Facility [Member] | Trache B [Member]              
Debt Instrument [Line Items]              
Line of credit facility, expiration date Apr. 08, 2024