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Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||
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Mar. 31, 2012
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Apr. 02, 2011
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Dec. 31, 2011
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| Financial Instrument [Line Items] | |||
| Available-for-sale investments in money market funds used as collateral | $ 10 | $ 10 | |
| Available-for-sale marketable debt securities maturity, years | 1 | ||
| Maturity of auction rate securities, minimum | January 2030 | ||
| Maturity of auction rate securities, maximum | December 2050 | ||
| Sales of available-for-sale securities | 6 | 8 | |
| Remaining auction rate securities at par value | 37 | ||
| Realized gain on available-for-sale securities | 0 | 1 | |
| Percent of total cash, cash equivalents and current marketable securities accounted for by Level 3 ARS | 2.00% | ||
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Corporate Bonds [Member]
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| Financial Instrument [Line Items] | |||
| Long-term marketable securities maturities period, maximum years | 2 | ||
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Auction Rate Securities [Member]
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| Financial Instrument [Line Items] | |||
| Remaining auction rate securities at par value | $ 32 | ||
| X | ||||||||||
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- Definition
Available for sale marketable debt securities maturity. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Long-term marketable securities stated maturities period maximum. No definition available.
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- Definition
Percent of total cash, cash equivalents and current marketable securities accounted for. No definition available.
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| X | ||||||||||
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- Definition
Remaining auction rate securities at par value. No definition available.
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| X | ||||||||||
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- Definition
Sales of available-for-sale securities. No definition available.
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| X | ||||||||||
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- Definition
The latest date, in a range of maturity dates, that a debt security categorized as neither trading nor held-to-maturity is scheduled to be repaid. No definition available.
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- Definition
The earliest date, in a range of maturity dates, that a debt security categorized as neither trading nor held-to-maturity is scheduled to be repaid. No definition available.
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| X | ||||||||||
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- Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The fair value of available-for-sale securities that serve as collateral for borrowings. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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