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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Goodwill $ 5,702 $ 5,702
Elan Financial Services    
Business Acquisition [Line Items]    
Trade accounts receivable 20  
Prepaid expenses and other current assets 94  
Property and equipment 9  
Intangible assets 353  
Goodwill 238  
Accounts payable and other current liabilities (55)  
Total purchase price $ 659