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Notes Payable - Components of Notes Payable (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Line of Credit Facility [Line Items] |  |
Notes payable | $ 420 | $ 425
Deferred loan costs | (2) | (2)
Less: current portion | (22) | (40)
Notes payable, noncurrent | 396 | 383
Notes Payable | Tranche A Term Loans |  |
Line of Credit Facility [Line Items] |  |
Notes payable | 0 | 303
Notes Payable | Tranche A-2 Term Loans |  |
Line of Credit Facility [Line Items] |  |
Notes payable | 0 | 122
Notes Payable | 2018 Term Loan A |  |
Line of Credit Facility [Line Items] |  |
Notes payable | $ 420 | $ 0
Annual contractual interest rate | 3.92% |
Effective interest rate | 4.02% |
Notes Payable | 2018 Term Loan A | LIBOR |  |
Line of Credit Facility [Line Items] |  |
Spread on variable rate | 1.625% |
Notes Payable | 2018 Term Loan A | Prime lending rate |  |
Line of Credit Facility [Line Items] |  |
Spread on variable rate | 0.625% |

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