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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2018
Oct. 05, 2018
Jan. 03, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Goodwill       $ 2,530 $ 2,181  
Amortization of purchased intangible assets       105 99 $ 32
InfoArmor            
Business Acquisition [Line Items]            
Payments to acquire businesses   $ 525        
Goodwill   318        
Intangible assets   257        
PlumChoice, Inc            
Business Acquisition [Line Items]            
Payments to acquire businesses $ 30          
Goodwill $ 23          
SquareTrade            
Business Acquisition [Line Items]            
Goodwill     $ 1,100      
Intangible assets     555      
Business combination, consideration transferred     1,400      
Commissions paid to retailers     66      
Prepaid Expense and other assets     205      
Unearned premiums     389      
Deferred tax liabilities     $ 138      
Amortization of purchased intangible assets       94 $ 92  
Customers relationships | InfoArmor            
Business Acquisition [Line Items]            
Intangible assets   225        
Customers relationships | SquareTrade            
Business Acquisition [Line Items]            
Intangible assets acquired       465    
Technology-Based Intangible Assets | InfoArmor            
Business Acquisition [Line Items]            
Intangible assets   $ 32        
Trade Names | SquareTrade            
Business Acquisition [Line Items]            
Indefinite-lived intangible assets acquired       $ 69