| **Commitments And Contingencies Subsequent Events (Details) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2014                                                                                                                                                                           |
|--------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Long Term Purchase Commitments**                                                                           |                                                                                                                                                                                    |
| Unrecorded Unconditional Purchase Obligation                                                                 | $ 1,438us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount                                                                                                              |
| Subsequent Event [Member]                                                                                    |                                                                                                                                                                                    |
| **Long Term Purchase Commitments**                                                                           |                                                                                                                                                                                    |
| Unrecorded Unconditional Purchase Obligation                                                                 | $ 780us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis= us-gaap_SubsequentEventMember |

| X                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsequentEventLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| 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=6394976&loc=d3e25336-109308
+ Details**Name:**us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=us-gaap_SubsequentEventMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |