CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
| Worksite employee related assets: |
|
|
| Advance collections |
$ 12
|
$ 12
|
| Worksite employee related liabilities: |
|
|
| Prepayments |
30
|
19
|
| Collateral paid, current |
5
|
6
|
| Collateral paid, noncurrent |
$ 16
|
$ 17
|
| Preferred stock ($0.000025 par value per share; 20,000,000 shares authorized; no shares issued and outstanding at March 31, 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; 70,363,251 and 69,818,392 shares issued and outstanding at March 31, 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) |
70,363,251
|
69,818,392
|
| Common stock, shares outstanding (in shares) |
70,363,251
|
69,818,392
|