| **Summary Of Components Of Available-For-Sale Securities (Details) (USD $)In Millions, unless otherwise specified**      | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]**                               |            |   |   |
| Adjusted cost                                                                                                            | $ 9             | $ 9 |   |
| Gross unrealized gains                                                                                                   | 32              | 30 |   |
| Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax | 8               | 0 | 3 |
| Pre-tax gain on sale of investment                                                                                       | 14              | 0 | 5 |
| Cost-method Investments, Other than Temporary Impairment                                                                 |            |   | 5 |
| Other Current Assets [Member]                                                                                            |            |   |   |
| **Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]**                               |            |   |   |
| Fair value                                                                                                               | $ 41            | $ 39 |   |

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| - Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.
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| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.
+ References
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| - Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.
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| - Definition
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.
+ References
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| - Definition
This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.
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| - Definition
Net of tax amount of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.
+ References
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