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Acquisition (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 03, 2017
Jun. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill   $ 2,309 $ 1,219
SquareTrade      
Business Acquisition [Line Items]      
Consideration transferred $ 1,400    
Goodwill 1,080    
Commissions paid to retailers 70    
Intangible assets 555    
Prepaid contractual liability insurance policy premium expenses 201    
Unearned premiums 373    
Net deferred income tax liability $ 140    
Goodwill, period increase   14  
Restricted cash   $ 30