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Description of Business and Significant Accounting Policies - Impact of the Adoption of Topic 606 on the Condensed Consolidated Income Statements (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue |  |  |  |
Professional service revenues | $ 129 | $ 120 |  |
Total revenues | 861 | 808 |  |
Expense |  |  |  |
Commissions expense | 4 |  |  |
Total expense | 790 | 758 |  |
Income before provision for income taxes | 67 | 45 |  |
Income tax expense | 13 | 16 |  |
Net income | $ 54 | $ 29 |  |
Basic EPS (in dollars per share) | $ 0.77 | $ 0.42 |  |
Diluted EPS (in dollars per share) | $ 0.75 | $ 0.41 |  |
Assets |  |  |  |
Unbilled revenue (net of advance collections) | $ 286 |  |  | $ 297
Prepaid expenses and other current assets | 22 |  |  | 15
Other assets | 18 |  |  | 16
Accounts payable and other current liabilities | 46 |  |  | 59
Liabilities |  |  |  |
Other liabilities | 10 |  |  | 14
Equity |  |  |  |
Retained earnings | (332) |  |  | $ (377)
Balance using Previous Standard |  |  |  |
Revenue |  |  |  |
Professional service revenues | 126 |  |  |
Total revenues | 858 |  |  |
Expense |  |  |  |
Commissions expense | 13 |  |  |
Total expense | 799 |  |  |
Income before provision for income taxes | 56 |  |  |
Income tax expense | 11 |  |  |
Net income | $ 45 |  |  |
Basic EPS (in dollars per share) | $ 0.64 |  |  |
Diluted EPS (in dollars per share) | $ 0.62 |  |  |
Assets |  |  |  |
Unbilled revenue (net of advance collections) | $ 291 |  |  |
Prepaid expenses and other current assets | 14 |  |  |
Other assets | 14 |  |  |
Liabilities |  |  |  |
Accounts payable and other current liabilities | 47 |  |  |
Other liabilities | 12 |  |  |
Equity |  |  |  |
Retained earnings | (342) |  |  |
ASU 2014-09 | Increase (Decrease) |  |  |  |
Revenue |  |  |  |
Professional service revenues | 3 |  |  |
Total revenues | 3 |  |  |
Expense |  |  |  |
Commissions expense | (9) |  |  |
Total expense | (9) |  |  |
Income before provision for income taxes | 11 |  |  |
Income tax expense | 2 |  |  |
Net income | $ 9 |  |  |
Basic EPS (in dollars per share) | $ 0.13 |  |  |
Diluted EPS (in dollars per share) | $ 0.13 |  |  |
Assets |  |  |  |
Unbilled revenue (net of advance collections) | $ (5) |  |  |
Prepaid expenses and other current assets | 8 |  |  |
Other assets | 4 |  |  |
Liabilities |  |  |  |
Accounts payable and other current liabilities | (1) |  |  |
Other liabilities | (2) |  |  |
Equity |  |  |  |
Retained earnings | $ 10 |  | $ 1 |

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