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Income Taxes (Details)
€ in Millions, $ in Millions, kr in Billions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Jan. 31, 2020
EUR (€)
Mar. 31, 2020
USD ($)
Mar. 31, 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     $ 99 $ 120          
Effective tax rate (in percent)     16.00% 21.00%          
Statutory income tax rate (in percent)     21.00%            
Swedish Tax Agency                  
Income Tax [Line Items]                  
Total assessment, including penalties and interest, not recorded           $ 352 kr 3.5    
French Tax Authority                  
Income Tax [Line Items]                  
Total assessment, including penalties and interest, not recorded               $ 632 € 571
Tax expense related to tax settlement         $ 54        
Tax payments, including interest and penalties $ 178 € 161