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Significant Accounting Policies (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Assets: |  |  |
Inventory, net | $ 455 | $ 448 | $ 458
Prepaid expenses and other current assets | 31 | 39 | 24
Long-term deferred income taxes | 114 |  |
Other long-term assets | 77 | 80 | 65
Liabilities: |  |  |
Deferred revenue | 184 | 201 | 186
Long-term deferred revenue | 142 | 144 | 148
Stockholders’ Equity: |  |  |
Retained earnings | 1,267 | 1,376 | 1,248
Increase in liability related to changes in revenue recognition | 1 |  |
Impact on revenue before new revenue recognition guidance |  | 977 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
Assets: |  |  |
Inventory, net |  |  | 458
Prepaid expenses and other current assets |  |  | 24
Long-term deferred income taxes |  |  | 119
Other long-term assets |  |  | 65
Liabilities: |  |  |
Deferred revenue |  |  | 186
Long-term deferred revenue |  |  | 148
Stockholders’ Equity: |  |  |
Retained earnings |  |  | $ 1,248
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
Stockholders’ Equity: |  |  |
Impact on revenue before new revenue recognition guidance |  | $ 1 |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Assets: |  |  |
Inventory, net | (3) |  |
Prepaid expenses and other current assets | 7 |  |
Long-term deferred income taxes | (5) |  |
Other long-term assets | 12 |  |
Liabilities: |  |  |
Deferred revenue | (2) |  |
Long-term deferred revenue | (6) |  |
Stockholders’ Equity: |  |  |
Retained earnings | 19 |  |
Adjustment related to reallocation of revenue between performance obligations | $ (3) |  |

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