| 
           Property, Plant and Equipment (Details) (USD $) 
        In Millions, unless otherwise specified  | 
        12 Months Ended | ||
|---|---|---|---|
| 
           Dec. 31, 2012 
         | 
        
           Dec. 31, 2011 
         | 
        
           Dec. 31, 2010 
         | 
      |
| 
           LNG terminal costs [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Interest Costs Capitalized | $ 35.1 | ||
| 
           Sabine Pass LNG terminal [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Storage capacity | 16.9 | ||
| 
           Sabine Pass LNG terminal [Member] | LNG terminal costs [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Depreciation | 42.1 | 42.6 | 41.8 | 
| 
           Sabine Pass LNG terminal [Member] | LNG storage tanks [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, useful life | 50 years | ||
| 
           Sabine Pass LNG terminal [Member] | Marine berth, electrical, facility and roads [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, useful life | 35 years | ||
| 
           Sabine Pass LNG terminal [Member] | Regasification processing equipment (recondensers, vaporization, and vents) [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, useful life | 30 years | ||
| 
           Sabine Pass LNG terminal [Member] | Sendout pumps [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, useful life | 20 years | ||
| 
           Corpus Christi LNG [Member] | LNG terminal costs [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, Gross | $ 35.5 | ||
| 
           Minimum [Member] | Sabine Pass LNG terminal [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, useful life | 15 years | ||
| 
           Minimum [Member] | Sabine Pass LNG terminal [Member] | Other Energy Equipment [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, useful life | 15 years | ||
| 
           Maximum [Member] | Sabine Pass LNG terminal [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, useful life | 50 years | ||
| 
           Maximum [Member] | Sabine Pass LNG terminal [Member] | Other Energy Equipment [Member] 
         | 
        |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, useful life | 30 years | ||