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Revenue Recognition Revenue Recognition - Adoption of the New Revenue Standard (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |
Trade receivables |  | $ 163 | $ 154 | $ 153
Other current assets |  | 159 | 181 | 179
Total current assets |  | 760 | 792 | 789
Other non-current assets |  | 271 | 245 | 222
Assets |  | 7,325 | 7,363 | 7,337
Accrued expenses and other current liabilities |  | 426 | 480 | 478
Total current liabilities |  | 1,081 | 957 | 955
Deferred income taxes |  | 291 | 319 | 327
Other non-current liabilities |  | 262 | 266 | 212
Total liabilities |  | 4,897 | 4,763 | 4,715
Accumulated deficit |  | (2,711) |  | (2,631)
Accumulated other comprehensive loss |  | (44) |  | (37)
Total stockholders' equity |  | 2,425 | 2,596 | 2,618
Total equity |  | 2,428 | 2,600 | 2,622
Total liabilities and equity |  | 7,325 | 7,363 | $ 7,337
Accounting Standards Update 2014-09 |  |  |  |
Cumulative Effect of New Accounting Pronouncements[Abstract] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ (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 New Accounting Principle in Period of Adoption |  |  | 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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