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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 16, 2019
Oct. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]        
Cash purchase price     $ (56) $ 0
Elan Financial Services        
Business Acquisition [Line Items]        
Payments for acquisitions of businesses   $ 660    
Cash purchase price   691    
Working capital adjustments   57    
Earn-out provisions, fair value   12    
Future payments under a transition services agreement   $ 14    
Transition services agreement term     2 years  
Revenue of acquiree since acquisition date     $ 46  
Impact to operating income of acquiree since acquisition date     9  
Acquired intangible asset amortization     $ 6  
First Data        
Business Acquisition [Line Items]        
Consideration transferred, equity value $ 22,000