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Acquisitions and Dispositions of Businesses - Acquisitions (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
acquisition
Dec. 31, 2018
USD ($)
acquisition
Business Acquisition    
Number of business acquired under business combination | acquisition 1 8
Assets acquired    
Goodwill $ 8,219 $ 8,171
2019 Acquisitions    
Business Combination, Consideration Transferred [Abstract]    
Consideration Transferred 17  
Deferred and contingent consideration 5  
Aggregate consideration transferred 22  
Assets acquired    
Cash and cash equivalents 2  
Goodwill 15  
Intangible assets, net 9  
Other assets 4  
Total assets acquired 30  
Liabilities assumed    
Current liabilities 6  
Other non-current liabilities 2  
Total liabilities assumed 8  
Net assets acquired $ 22