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Income Taxes (Details)
€ in Millions, $ in Millions, kr in Billions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Jan. 31, 2020
EUR (€)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
SEK (kr)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Income Tax [Line Items]                      
Income tax expense     $ 118 $ 45 $ 365 $ 208          
Effective tax rate (in percent)     16.00% 18.00% 18.00% 18.00%          
Statutory income tax rate (in percent)         21.00%            
Swedish Tax Agency                      
Income Tax [Line Items]                      
Total assessment, including penalties and interest, not recorded               $ 386 kr 3.5    
French Tax Authority                      
Income Tax [Line Items]                      
Total assessment, including penalties and interest, not recorded                   $ 666 € 571
Tax expense related to tax settlement             $ 54        
Tax payments, including interest and penalties $ 188 € 161