Financial Instruments (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Dec. 30, 2017 |
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| Foreign Currency Forward Contracts | ||
| Schedule of Investments [Line Items] | ||
| Contract maturity period | 12 months | |
| Maximum length of time hedged in foreign currency cash flow hedges | 12 months | |
| Cash Flow Hedging | Foreign Currency Forward Contracts | ||
| Schedule of Investments [Line Items] | ||
| Derivative, notional amount | $ 336 | $ 300 |
| Level 1 | Government money market funds | ||
| Schedule of Investments [Line Items] | ||
| Investment in money market fund and bank guarantee | 3 | 2 |
| Level 1 | Bank guarantee | ||
| Schedule of Investments [Line Items] | ||
| Investment in money market fund and bank guarantee | 3 | |
| Level 1 | Mutual funds | ||
| Schedule of Investments [Line Items] | ||
| Restricted investments | $ 18 | $ 18 |
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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- Definition Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of cash equivalents restricted as to withdrawal or usage. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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