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Acquisition - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 03, 2017
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill   $ 2,181 $ 1,219
SquareTrade      
Business Acquisition [Line Items]      
Business combination, consideration transferred $ 1,400    
Goodwill 1,090    
Commissions paid to retailers 66    
Intangible assets 555    
Prepaid Expense and other assets 205    
Unearned premiums 389    
Deferred tax liabilities $ 138    
Amortization of intangible assets   92  
Customer Relationships | SquareTrade      
Business Acquisition [Line Items]      
Intangible assets acquired   $ 465  
Useful life   10 years  
Trade Names | SquareTrade      
Business Acquisition [Line Items]      
Indefinite-lived intangible assets acquired   $ 69