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Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2019
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit Plan The Company maintains a 401(k) savings plan covering substantially all of its employees. Eligible employees may contribute up to 80% of their annual salary through payroll deductions, but not more than the statutory limits set by the Internal Revenue Service. The Company matches employee contributions at the discretion of the Board. During 2019, 2018 and 2017, the Company’s matching contributions totaled $47 million, $27 million and $20 million, respectively.