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Debt and Credit Agreements - Additional Information (Detail)
€ in Millions, kr in Millions
1 Months Ended 12 Months Ended
Jun. 18, 2018
EUR (€)
Dec. 31, 2020
EUR (€)
Jun. 30, 2020
SEK (kr)
Jul. 31, 2016
USD ($)
Bank
Option
Dec. 31, 2020
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2020
SEK (kr)
Dec. 31, 2019
USD ($)
Jun. 30, 2018
Line Of Credit Facility [Line Items]                  
Short-term debt [1]         $ 301,800,000     $ 368,100,000  
Short-term debt excluding commercial paper         487,000,000        
Short-term debt excluding commercial paper, utilized amount         $ 27,000,000        
Weighted average interest rate on short-term debt         3.00%   3.00% 3.00%  
Long-term debt [1]         $ 2,109,600,000     $ 1,726,100,000  
Money market funds         392,000,000        
Banks Rated BBB+                  
Line Of Credit Facility [Line Items]                  
Calculated risk amount         50,000,000        
Banks Rated A- or Above                  
Line Of Credit Facility [Line Items]                  
Calculated risk amount         150,000,000        
Swedish Program                  
Line Of Credit Facility [Line Items]                  
Commercial paper         855,000,000   kr 7,000    
United States Program                  
Line Of Credit Facility [Line Items]                  
Long term debt issued         0        
Commercial paper         1,000,000,000.0        
Swedish Program and U.S. Program                  
Line Of Credit Facility [Line Items]                  
Long term debt issued         $ 0        
Senior Unsecured Revolving Credit Facility Agreement                  
Line Of Credit Facility [Line Items]                  
Debt Instrument Term       5 years          
Revolving credit facility amount       $ 1,100,000,000          
Number of options to request banks for extension of debt instruments maturity | Option       2          
Extended maturity       Jul. 31, 2023          
Percentage of commitment fee as compared to applicable margin rate         35.00%        
Senior Unsecured Revolving Credit Facility Agreement | Syndicated by Banks                  
Line Of Credit Facility [Line Items]                  
Number of banks syndicated on revolving credit facility | Bank       14          
Senior Unsecured Revolving Credit Facility Agreement | Syndicated by Banks | Banks Rated BBB+                  
Line Of Credit Facility [Line Items]                  
Line of credit facility commitment fee percent         0.375%        
Loan from Swedish Export Credit Corporation                  
Line Of Credit Facility [Line Items]                  
Repayment of debt | kr     kr 1,200            
Floating rate basis         3M STIBOR        
Percentage of margin     0.54%            
Debt Instrument Term     3 years            
Long-term loan facility utilized | kr     kr 6,000            
Eurobond                  
Line Of Credit Facility [Line Items]                  
Debt Instrument Term 5 years                
Long term debt issued | € € 500                
Notes stated percentage                 0.75%
Commercial Paper | Maximum                  
Line Of Credit Facility [Line Items]                  
Money market funds         $ 2,000,000,000        
Local Debt                  
Line Of Credit Facility [Line Items]                  
Short-term debt         27,000,000        
USPP Bond Maturing in April 2021                  
Line Of Credit Facility [Line Items]                  
Short-term debt         $ 275,000,000        
18-Month Floating Rate Notes                  
Line Of Credit Facility [Line Items]                  
Repayment of debt | €   € 100              
Floating rate basis         3M Euribor        
Percentage of margin   0.50%              
Loan Maturing in 2022 | Loan from Swedish Export Credit Corporation                  
Line Of Credit Facility [Line Items]                  
Floating rate basis         3M STIBOR        
Percentage of margin     1.35%            
Long-term loan facility utilized | kr     kr 3,000            
Loan Maturing in 2025 | Loan from Swedish Export Credit Corporation                  
Line Of Credit Facility [Line Items]                  
Floating rate basis         3M STIBOR        
Percentage of margin     1.85%            
Long-term loan facility utilized | kr     kr 3,000            
Senior Notes Seven Year                  
Line Of Credit Facility [Line Items]                  
Debt Instrument Term           7 years      
Long term debt issued           $ 275,000,000      
Notes stated percentage           3.51%      
Senior Notes Ten Year                  
Line Of Credit Facility [Line Items]                  
Debt Instrument Term           10 years      
Long term debt issued           $ 297,000,000      
Notes stated percentage           4.09%      
Senior Notes Twelve Year                  
Line Of Credit Facility [Line Items]                  
Debt Instrument Term           12 years      
Long term debt issued           $ 285,000,000      
Notes stated percentage           4.24%      
Senior Notes Fifteen Year                  
Line Of Credit Facility [Line Items]                  
Debt Instrument Term           15 years      
Long term debt issued           $ 185,000,000      
Notes stated percentage           4.44%      
[1] Debt as reported in balance sheet.