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Revenue Recognition Revenue Recognition - Adoption of the New Revenue Standard (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Trade receivables |  | $ 180 |  | $ 154 | $ 153 |  |  |
Other current assets |  | 154 |  | 181 | 179 |  |  |
Total current assets |  | 905 |  | 792 | 789 |  |  |
Other non-current assets |  | 284 |  | 245 | 222 |  |  |
Assets |  | 7,438 |  | 7,363 | 7,337 |  |  |
Accrued expenses and other current liabilities |  | 395 |  | 480 | 478 |  |  |
Total current liabilities |  | 1,567 |  | 957 | 955 |  |  |
Deferred income taxes |  | 378 |  | 319 | 327 |  |  |
Other non-current liabilities |  | 244 |  | 266 | 212 |  |  |
Total liabilities |  | 4,995 |  | 4,763 | 4,715 |  |  |
Accumulated deficit |  | (2,485) |  |  | (2,631) |  |  |
Accumulated other comprehensive loss |  | (47) |  |  | (37) |  |  |
Total stockholders' equity |  | 2,439 |  | 2,596 | 2,618 |  |  |
Total equity |  | 2,443 | $ 2,442 | 2,600 | 2,622 | $ 2,465 | $ 2,423 | $ 2,469
Total liabilities and equity |  | $ 7,438 |  | 7,363 | $ 7,337 |  |  |
Cumulative effect of adoption of new accounting pronouncements |  |  |  | (22) |  |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Cumulative effect of adoption of new accounting pronouncements |  |  |  | (22) |  |  |  |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Accumulated deficit | [1] |  |  | (2,622) |  |  |  |
Accumulated other comprehensive loss | [1] |  |  | (46) |  |  |  |
Cumulative effect of adoption of new accounting pronouncements |  |  |  | 9 |  |  |  |
Accounting Standards Update 2018-02 and 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Accumulated deficit | [1] |  |  | (2,644) |  |  |  |
Accumulated other comprehensive loss | [1] |  |  | (46) |  |  |  |
Trade Accounts Receivable | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 1 |  |  |  |
Other Current Assets | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 2 |  |  |  |
Current Assets | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 3 |  |  |  |
Other Non-Current Assets | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 23 |  |  |  |
Assets, Total | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 26 |  |  |  |
Accounts Payable and Accrued Liabilities | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 2 |  |  |  |
Current Liabilities | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 2 |  |  |  |
Deferred Income Tax Charge | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | (8) |  |  |  |
Other Non-Current Liabilities | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 54 |  |  |  |
Liabilities, Total | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | 48 |  |  |  |
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard | [1] |  |  | (22) |  |  |  |
AOCI Attributable to Parent | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard | [1] |  |  | 0 |  |  |  |
Stockholders' Equity, Total | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | (22) |  |  |  |
Liabilities and Equity, Total | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |  |  |  |  |
Adjustments due to the adoption of the new revenue standard |  |  |  | $ 26 |  |  |  |
[1] | Beginning balances have been adjusted for the adoption of the accounting standard update on stranded tax effects related to the 2017 Tax Act which resulted in a debit to Accumulated other comprehensive loss and a credit to Accumulated deficit of $9 million. See Note 1, "Basis of Presentation" in the "Recently Adopted Accounting Pronouncements" section for additional information.

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