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Financing Arrangements - Term Loan (Details) $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 25, 2017 USD ($) | Aug. 18, 2017 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($)
Term loan credit agreement due April 25, 2019 |  |  |  |
Long-term debt |  |  |  |
Number of borrowings | item |  | 3 |  |
Maximum borrowing capacity |  | $ 500 |  |
Term of the credit agreement |  | 18 months |  |
Aggregate principal amount | $ 420 |  |  |
Repayments of long-term debt |  |  | $ 25 | $ 230
Long-term debt excluding fair value adjustments |  |  | $ 395 | $ 165
1.8% senior notes due September 25, 2017 |  |  |  |
Long-term debt |  |  |  |
Repayments of long-term debt | $ 300 |  |  |
Debt, interest rate (as a percent) | 1.80% |  |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, excluding fair value adjustments related to hedged debt instruments. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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- Definition Represents number of borrowings. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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