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Revenue from Contracts with Customers - Impacts on Financial Statements (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  | $ (823) |  |  |  | $ (579) |  |  |  | $ (823) | $ (579) |
Increase in other assets |  | 54 |  |  |  | 17 |  |  |  | 54 | 17 |
Tax impact |  |  |  |  |  |  |  |  |  | (3) | 125 | $ 96
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 666 | 651 | 662
Net income (loss) |  | $ 15 | $ 18 | $ 4 | $ (7) | $ (74) | $ 13 | $ (4) | $ (2) | $ 30 | $ (67) | $ 125
Basic (in usd per share) |  | $ 0.13 | $ 0.15 | $ 0.03 | $ (0.06) | $ (0.61) | $ 0.11 | $ (0.03) | $ (0.02) | $ 0.25 | $ (0.53) | $ 0.96
Assets |  | $ 2,360 |  |  |  | $ 2,556 |  |  |  | $ 2,360 | $ 2,556 |
Contract with customer, deferred costs |  | 595 |  |  |  | 499 |  |  |  | 595 | 499 |
Liabilities |  | 1,865 |  |  |  | $ 1,888 |  |  |  | 1,865 | $ 1,888 |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ 19 |  |  |  |  |  |  |  |  |  |  |
Increase in other assets | 17 | 54 |  |  |  |  |  |  |  | 54 |  |
Tax impact | 10 |  |  |  |  |  |  |  |  |  |  |
Unbilled contract receivables | 20 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 15 |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 37 |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ 33 |  |
Basic (in usd per share) |  |  |  |  |  |  |  |  |  | $ 0.27 |  |
Assets |  | 43 |  |  |  |  |  |  |  | $ 43 |  |
Contract with customer, deferred costs |  | 11 |  |  |  |  |  |  |  | 11 |  |
Liabilities |  | $ 16 |  |  |  |  |  |  |  | $ 16 |  |
Deferred Tax Liability | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [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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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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