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Acquisitions (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 05, 2018 | Jan. 03, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 2,189 |  | $ 2,189 |  | $ 2,181
SquareTrade |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred |  | $ 1,400 |  |  |  |  |
Goodwill |  | 1,100 |  |  |  |  |
Commissions paid to retailers |  | 66 |  |  |  |  |
Intangible assets |  | 555 |  |  |  |  |
Prepaid contractual liability insurance policy premium expenses |  | 205 |  |  |  |  |
Unearned premiums |  | 389 |  |  |  |  |
Net deferred income tax liability |  | 138 |  |  |  |  |
Amortization of intangible assets |  |  | $ 20 | $ 23 | $ 61 | $ 69 |
Customer Relationships | SquareTrade |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  | 465 |  |  |  |  |
Trade Names | SquareTrade |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Indefinite-lived intangible assets acquired |  | $ 69 |  |  |  |  |
Subsequent Event | InfoArmor |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire businesses | $ 525 |  |  |  |  |  |

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