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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Jul. 29, 2020
Jul. 29, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 29, 2019
Income Tax Contingency [Line Items]            
Valuation allowance $ 888     $ 1,145    
Unrecognized tax benefits that would impact effective tax rate 116          
Decrease in unrecognized tax benefits reasonably possible 61          
Interest expense and penalties 3     2 $ 1  
Accrued interest expense and penalties 22     $ 19    
First Data            
Income Tax Contingency [Line Items]            
Deferred tax liabilities           $ 3,671
Measurement period adjustment, recognized deferred tax liabilities   $ 169 $ 136      
Research and development costs related to First Data $ 150