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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Deferred revenue, revenue recognized |  |  |  | $ 335 |  |
Remaining performance obligation, amount of customer only general cancellation |  | $ 923 |  | 923 |  |
Remaining performance obligation, amount of non-cancelable contracts |  | 522 |  | 522 |  |
Accumulated deficit |  | (714) |  | (714) |  | $ (579)
Capitalized contract cost, net |  | 24 |  | 24 |  | 17
Income tax expense (benefit) |  | 2 | $ 1 | 1 | $ 1 |
Selling, general and administrative expenses |  | 163 | 165 | 315 | 320 |
Net income (loss) |  | $ 4 | $ (4) | $ (3) | $ (6) |
Basic (in dollars per share) |  | $ 0.03 | $ (0.03) | $ (0.02) | $ (0.05) |
Assets |  | $ 2,203 |  | $ 2,203 |  | 2,556
Contract with customer, liability |  | 570 |  | 570 |  | 499
Liabilities |  | 1,631 |  | 1,631 |  | $ 1,888
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Accumulated deficit | $ 19 |  |  |  |  |
Capitalized contract cost, net | 17 | 24 |  | 24 |  |
Income tax expense (benefit) | 10 |  |  |  |  |
Unbilled contracts receivable | 20 |  |  |  |  |
Revenues |  | 19 |  | 20 |  |
Selling, general and administrative expenses |  | 3 |  | 8 |  |
Net income (loss) |  | $ 4 |  | $ 8 |  |
Basic (in dollars per share) |  | $ 0.03 |  | $ 0.07 |  |
Assets |  | $ 8 |  | $ 8 |  |
Contract with customer, liability |  | $ 16 |  | $ 16 |  |
Liabilities | 36 |  |  |  |  |
Deferred Tax Liability | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Accumulated deficit | $ 26 |  |  |  |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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