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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 |  |

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