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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Automatic enrollment feature pre-tax | 6.00% |  |
Maximum employer contribution | 50.00% |  |
Maximum employee contributions percentage to receive 50% matching | 6.00% |  |
Employer match, percent | 3.00% |  |
Contributions vested with the employees | 2 years |  |
Contributions to plans | $ 14 | $ 13 | $ 9
Target bonus multiplier | 1, 1.5 or 2 |  |
Director |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Common stock reserved for issuance to non-employee directors | 6,267 |  |
Director | 2011 Plan |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Common stock reserved for issuance to non-employee directors | 100,000 |  |
Maximum |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
No of installments for payments upon termination | Payments upon termination will be made in either one lump sum or up to five annual installments, as elected by the eligible director at the time of the deferral election. |  |
Period of continued payment of base salary in event of termination by company without cause more than 3 months prior to or 12 months following change in control | 18 months |  |
Period of continued coverage of health insurance premium in event of termination by company without cause more than 3 months prior to or 12 months following change in control | 18 months |  |
Period of lump sum salary payment in event of termination by company without cause or by participant for good reason within 3 months prior to or 12 months following change in control | 24 months |  |
Period of lump sum insurance premium payment in event of termination by company without cause or by participant for good reason within 3 months prior to or 12 months following change in control | 24 months |  |
Minimum |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Period of continued payment of base salary in event of termination by company without cause more than 3 months prior to or 12 months following change in control | 6 months |  |
Period of continued coverage of health insurance premium in event of termination by company without cause more than 3 months prior to or 12 months following change in control | 6 months |  |
Period of lump sum salary payment in event of termination by company without cause or by participant for good reason within 3 months prior to or 12 months following change in control | 12 months |  |
Period of lump sum insurance premium payment in event of termination by company without cause or by participant for good reason within 3 months prior to or 12 months following change in control | 12 months |  |
Pre-tax basis |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Maximum annual employee contribution, percent | 50.00% |  |
After-tax basis |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Maximum annual employee contribution, percent | 10.00% |  |

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- Definition Defined contribution plan maximum percent of employee contribution to receive 50% matching. + References No definition available. + Details
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- Definition Period of continued coverage of health insurance premium in event of termination by company without cause more than 3 months prior to or 12 months following change in control. + References No definition available. + Details
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- Definition Period of continued payment of base salary in event of termination by company without cause more than 3 months prior to or 12 months following change in control. + References No definition available. + Details
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- Definition Period of lump sum insurance premium payment in event termination by company without cause or by participant for good reason within 3 months prior to or 12 months following change in control. + References No definition available. + Details
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