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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Worksite employee related assets: |  |
Advance collections | $ 14 | $ 12
Worksite employee related liabilities: |  |
Prepayments | 38 | 19
Collateral paid, current | 5 | 6
Collateral paid, noncurrent | $ 15 | $ 17
Preferred stock ($0.000025 par value per share; 20,000,000 shares authorized; no shares issued and outstanding at June 30, 2018 and December 31, 2017) |  |
Preferred stock, par value (in dollars per share) | $ 0.000025 | $ 0.000025
Preferred stock, shares authorized (in shares) | 20,000,000 | 20,000,000
Preferred stock, shares issued (in shares) | 0 | 0
Preferred stock, shares outstanding (in shares) | 0 | 0
Common stock and additional paid-in capital ($0.000025 par value per share; 750,000,000 shares authorized; 70,573,887 and 69,818,392 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively) |  |
Common stock, par value (in dollars per share) | $ 0.000025 | $ 0.000025
Common stock, shares authorized (in shares) | 750,000,000 | 750,000,000
Common stock, shares issued (in shares) | 70,573,887 | 69,818,392
Common stock, shares outstanding (in shares) | 70,573,887 | 69,818,392

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