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Acquisitions (Details) - USD ($) $ in Millions | Nov. 30, 2018 | Oct. 05, 2018 | Mar. 31, 2019 | Feb. 12, 2019 | Dec. 31, 2018
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 2,547 |  | $ 2,530
iCracked |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 17 |
PlumChoice, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 23 |  |  |  |
Payments to acquire businesses | $ 30 |  |  |  |
InfoArmor |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 318 |  |  |
Payments to acquire businesses |  | 525 |  |  |
Intangible assets |  | 257 |  |  |
Customer Relationships | InfoArmor |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets |  | 225 |  |  |
Technology-Based Intangible Assets | InfoArmor |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets |  | $ 32 |  |  |

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