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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 16, 2019
Oct. 31, 2018
Jun. 30, 2019
Jun. 30, 2019
Elan Financial Services        
Business Acquisition [Line Items]        
Payments for acquisitions of businesses   $ 659    
Cash purchase price   691    
Working capital adjustments   57    
Earn-out provisions, fair value   12    
Future payments under a transition services agreement   $ 13    
Transition services agreement term       2 years
Revenue of acquiree since acquisition date     $ 45 $ 91
Impact to operating income of acquiree since acquisition date     5 14
Acquired intangible asset amortization     $ 6 $ 12
First Data        
Business Acquisition [Line Items]        
Consideration transferred, equity value $ 22,000