| **Commitments And Contingencies (Narrative) (Details) $ in Millions**                   | Sep. 30, 2016 USD ($) |
|-----------------------------------------------------------------------------------------|-----------------------|
| **Loss Contingencies [Line Items]**                                                     |                  |
| Unrecorded Unconditional Purchase Obligation                                            | $ 2,535               |
| Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals          | 1                     |
| Amount of potential cash payments that could result from unrecognized tax benefits      | 86                    |
| Unrecorded Unconditional Purchase Obligation Payable in Common Stock Per Year | Maximum |                  |
| **Loss Contingencies [Line Items]**                                                     |                  |
| Unrecorded Unconditional Purchase Obligation                                            | 10                    |
| Unrecorded Unconditional Purchase Obligation Payable in Common Stock | Maximum          |                  |
| **Loss Contingencies [Line Items]**                                                     |                  |
| Unrecorded Unconditional Purchase Obligation                                            | $ 32                  |

| X                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of potential cash payments that could result from unrecognized tax benefits
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractually required future rental payments receivable on noncancelable subleasing arrangements.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308
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| X                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                               |
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