| **Property and Equipment, Net Depreciation Expense, Amortization Expense, and Interest Capitalized (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------|
||
| **Property, Plant and Equipment [Line Items]**                                                                                                                |                                                                                                              |   |   |
| Depreciation                                                                                                                                                  | $ 206us-gaap_Depreciation                                                                                         | $ 260us-gaap_Depreciation | $ 248us-gaap_Depreciation |
| Amortization                                                                                                                                                  | 3us-gaap_AdjustmentForAmortization                                                                                | 0us-gaap_AdjustmentForAmortization | 4us-gaap_AdjustmentForAmortization |
| Interest Costs Capitalized                                                                                                                                    | 0us-gaap_InterestCostsCapitalized                                                                                 | 5us-gaap_InterestCostsCapitalized | 9us-gaap_InterestCostsCapitalized |
| Equipment Leased to Other Party [Member]                                                                                                                      |                                                                                                              |   |   |
| **Property, Plant and Equipment [Line Items]**                                                                                                                |                                                                                                              |   |   |
| Depreciation                                                                                                                                                  | $ 105us-gaap_Depreciation/ us-gaap_PropertyPlantAndEquipmentByTypeAxis= us-gaap_EquipmentLeasedToOtherPartyMember | $ 135us-gaap_Depreciation/ us-gaap_PropertyPlantAndEquipmentByTypeAxis= us-gaap_EquipmentLeasedToOtherPartyMember | $ 46us-gaap_Depreciation/ us-gaap_PropertyPlantAndEquipmentByTypeAxis= us-gaap_EquipmentLeasedToOtherPartyMember |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585
+ Details**Name:**us-gaap_AdjustmentForAmortization**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585
+ Details**Name:**us-gaap_Depreciation**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest capitalized during the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391
+ Details**Name:**us-gaap_InterestCostsCapitalized**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentLeasedToOtherPartyMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |