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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 10,000,000 | 10,000,000 |
Preferred stock, par value (in usd per share) |  |  |  |  | $ 0.001 | $ 0.001 |
Preferred stock, shares outstanding (in shares) |  |  |  |  | 0 | 0 |
Common stock, shares authorized to repurchase |  |  |  |  | 16,000,000 |  |
Remaining number of shares available to be repurchased |  |  |  |  | 7,000,000 |  |
Treasury stock, shares, acquired |  |  |  |  | 1,000,000 | 1,000,000 |
Payments for repurchase of common stock |  |  |  |  | $ 71 | $ 65 | $ 63
Common stock issued for stock offering |  |  |  |  | $ 2,779 |  |
MHM Services |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Consideration transferred shares issued (in shares) |  | 3,000,000 |  |  |  |  |
Consideration transferred, common stock issued, value |  | $ 183 |  |  |  |  |
Community Medical Holdings Corp |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Consideration transferred shares issued (in shares) |  |  |  | 3,000,000 |  |  |
Consideration transferred, common stock issued, value |  |  | $ 149 |  |  |  |
Interpreta |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Consideration transferred shares issued (in shares) |  |  | 3,000,000 |  |  |  |
Consideration transferred, common stock issued, value |  |  | $ 175 |  |  |  |
Percentage of voting interests acquired |  |  | 61.00% | 61.00% |  |  |
Public Stock Offering |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued in registered offering (in shares) | 53,000,000 |  |  |  |  |  |
Common stock issued for stock offering | $ 2,860 |  |  |  |  |  |
Net proceeds from sale of stock after underwriting discounts and commissions | $ 2,779 |  |  |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Over allotment option to purchase additional shares, percentage | 10.00% |  |  |  |  |  |

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