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Acquisitions and Dispositions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Oct. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 5,702   $ 5,590 $ 5,373
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   240    
Accounts payable and other current liabilities   (56)    
Total purchase price   $ 660