Fair Value Measurements of Financial Instruments - Narrative (Details) - Fair Value, Inputs, Level 2 - USD ($) $ in Billions |
Dec. 31, 2018 |
Dec. 31, 2017 |
---|---|---|
Term Loan | ||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Long-term debt fair value | $ 1.4 | |
Senior Credit Facility – Term Loan due May 2025 | Senior Secured Credit Facility | ||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Long-term debt fair value | $ 2.5 |