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Long-Term Debt - Components of Notes Payable (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Line of Credit Facility [Line Items] |  |
Notes payable | $ 414 | $ 425
Deferred loan costs | (1) | (2)
Less: current portion | (22) | (40)
Long-term debt, noncurrent | 391 | 383
Notes Payable | Term Loan A |  |
Line of Credit Facility [Line Items] |  |
Notes payable | $ 0 | 303
Annual Contractual Interest Rate | 3.95% |
Effective Interest Rate | 4.07% |
Notes Payable | Term Loan A | LIBOR |  |
Line of Credit Facility [Line Items] |  |
Spread on variable rate | 2.25% |
Notes Payable | Term Loan A | Prime lending rate |  |
Line of Credit Facility [Line Items] |  |
Spread on variable rate | 1.25% |
Notes Payable | Term loan A-2 |  |
Line of Credit Facility [Line Items] |  |
Notes payable | $ 0 | 122
Annual Contractual Interest Rate | 3.83% |
Effective Interest Rate | 3.90% |
Notes Payable | Term loan A-2 | LIBOR |  |
Line of Credit Facility [Line Items] |  |
Spread on variable rate | 2.125% |
Notes Payable | Term loan A-2 | Prime lending rate |  |
Line of Credit Facility [Line Items] |  |
Spread on variable rate | 1.125% |
Notes Payable | 2018 Term Loan A |  |
Line of Credit Facility [Line Items] |  |
Notes payable | $ 414 | $ 0
Annual Contractual Interest Rate | 4.15% |
Effective Interest Rate | 4.25% |
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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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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