| **Financial Instruments (Narrative) (Details) (USD $)In Millions, unless otherwise specified** | 1 Months Ended | 3 Months Ended | 9 Months Ended |        |        |
|------------------------------------------------------------------------------------------------|----------------|----------------|----------------|--------|--------|
||
| **Financial Instruments**                                                                      |           |           |           |   |   |   |  |   |
| Proceeds from Sale of Investment Projects                                                      | $ 46           | $ 25           |           |   |   |   |  |   |
| Gain on Sale of Investments                                                                    | 25             | 14             |           |   |   |   |  |   |
| Cash and Cash Equivalents, at Carrying Value                                                   |           | 1,158          | 1,242          | 1,158  | 1,242  | 1,293 | [1] | 1,579 |
| Contractual interest rate of 0.75% Convertible Senior Notes due 2016                           |           | 0.75%          |           | 0.75%  |   | 0.75% |  |   |
| Impairment charges on marketable equity securities                                             |           | $ 0            | $ 0            | $ 0    | $ 0    |   |  |   |
| 0.75% Convertible Senior Notes Due 2016                                                        |           |           |           |   |   |   |  |   |
| **Financial Instruments**                                                                      |           |           |           |   |   |   |  |   |
| Contractual interest rate of 0.75% Convertible Senior Notes due 2016                           |           | 0.75%          |           | 0.75%  |   | 0.75% |  |   |
|                                                                                                |
| [1]Derived from audited consolidated financial statements.                                     |

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| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Interest rate stated in the contractual debt agreement.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The difference between the carrying value and the sale price of an investment.  A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment.  This element refers to the Gain included in earnings and not to the cash proceeds of the sale.
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of loss recognized for other than temporary impairments (OTTI) of investments in debt and equity securities.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the sale of investment projects held by an entity in hopes of getting a future return or interest from it.
+ References
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