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Supplemental Financial Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information |
| As of
In millions | June 30, 2018 |  | December 31, 2017
Inventories |  |  |
Finished goods | $ | 17 |  |  | $ | 18 |
Service parts | 11 |  |  | 12 |
Total inventories | $ | 28 |  |  | $ | 30 |
Deferred revenue |  |  |
Deferred revenue, current | $ | 461 |  |  | $ | 414 |
Long-term deferred revenue | 109 |  |  | 85 |
Total deferred revenue | $ | 570 |  |  | $ | 499 |

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