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Acquisitions and Dispositions (Details)
£ in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
acquisitions
Dec. 31, 2016
USD ($)
acquisitions
Jan. 10, 2018
USD ($)
Jan. 10, 2018
GBP (£)
May 11, 2017
USD ($)
Business Acquisition [Line Items]                
Payments for acquisitions of businesses       $ 384        
Earn-out provisions, fair value       $ 15        
Revenue of acquiree since acquisition date     $ 29          
Operating income of acquiree since acquisition date     6          
Acquired intangible asset amortization     4          
Number of acquisitions | acquisitions       4 2      
Cash acquired from acquisitions       $ 33        
Intangible assets $ 353     163        
Goodwill     5,702 5,590 $ 5,373      
Other identifiable net assets       19        
Assets held for sale     0 50        
Deferred tax liabilities     $ 20          
Goodwill, expected to be tax deductible       70        
Weighted-Average Useful Life 15 years   12 years          
Proceeds from sale of business     $ 419 17 0      
Discontinued Operations, Disposed of by Sale                
Business Acquisition [Line Items]                
Consideration from sale of business           $ 50 £ 37 $ 17
Gain from sale of business   $ 10            
Tax expense from sale of business   $ 5            
Customer related intangible assets                
Business Acquisition [Line Items]                
Intangible assets $ 350   $ 92          
Weighted-Average Useful Life 15 years   15 years          
Acquired software and technology                
Business Acquisition [Line Items]                
Intangible assets     $ 71          
Weighted-Average Useful Life     7 years          
Trade names                
Business Acquisition [Line Items]                
Intangible assets $ 3              
Weighted-Average Useful Life 8 years              
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   $ 12          
Future payments under a transition services agreement 14   $ 12          
Transition services agreement term     2 years          
Goodwill $ 240              
Series of Individually Immaterial Business Acquisitions                
Business Acquisition [Line Items]                
Cash purchase price         265      
Intangible assets         80      
Goodwill       $ 217 173      
Other identifiable net assets         $ 12