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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 29, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Business Acquisition [Line Items]            
Restricted cash and cash equivalents   $ 38,000,000 $ 40,000,000   $ 38,000,000  
Allowance for doubtful accounts   43,000,000 39,000,000   43,000,000  
Goodwill impairment     0      
Accumulated impairment loss   0     0  
Equity securities without a readily determinable fair value   164,000,000 167,000,000   164,000,000  
Interest expense   176,000,000   $ 64,000,000 365,000,000 $ 123,000,000
Interest income   2,000,000   $ 6,000,000 4,000,000 $ 8,000,000
First Data            
Business Acquisition [Line Items]            
Percentage of business acquired 100.00%          
Total purchase price for acquisition $ 46,475,000,000          
Merchant credit losses            
Business Acquisition [Line Items]            
Aggregate merchant credit losses incurred   24,000,000     54,000,000  
Collateral held   767,000,000 510,000,000   767,000,000  
Loss contingency accrual   $ 46,000,000 $ 34,000,000   $ 46,000,000