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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jun. 30, 2012
Boe
Jun. 30, 2011
Boe
Jun. 30, 2010
Boe
Jun. 30, 2009
Boe
Estimated Net Quantities of Proved Oil and Natural Gas Reserves        
Period on the basis of which reserve volumes and values are determined 12 months      
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf/BOE) 13,847,462 12,418,256 3,060,040  
Revisions of previous estimates (in Bbls/Mcf/BOE) (344,440) 1,937,405 (60,943)  
Improved recovery, extensions and discoveries (in Bbls/Mcf/BOE) 146,249 129,926 9,544,674  
Sales of minerals in place (in Bbls/Mcf/BOE) 0 (521,688)    
Production (sales volumes) (in Bbls/Mcf/BOE) (208,155) (116,437) (125,515)  
Balance at the end of the period (in Bbls/Mcf/BOE) 13,441,116 13,847,462 12,418,256  
Proved developed reserves (in BOE) 8,032,809 5,344,471 1,119,498 430,441
Increase (decrease) in proved reserves (in BOE) (400,000) 1,400,000 9,400,000  
Giddings Field
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in Bbls/Mcf/BOE) (369)      
Sales of minerals in place (in Bbls/Mcf/BOE)   (521,688)    
Delhi Field
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in Bbls/Mcf/BOE) 210      
Development capital spent by the operator since project inception     300  
Giddings Field and Oklahoma
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Extensions (in BOE)     127,905  
Lopez Field
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Number of well locations transferred 4      
Woodford properties in Oklahoma
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Revisions of previous estimates (in Bbls/Mcf/BOE) (127)      
Giddings Field in South Texas
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Improved recovery, extensions and discoveries (in Bbls/Mcf/BOE) 146      
Crude Oil
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf/BOE) 11,567,846 10,254,470 945,948  
Revisions of previous estimates (in Bbls/Mcf/BOE) 84,219 1,475,918 (113,487)  
Improved recovery, extensions and discoveries (in Bbls/Mcf/BOE) 137,634   9,451,758  
Sales of minerals in place (in Bbls/Mcf/BOE) 0 (104,577)    
Production (sales volumes) (in Bbls/Mcf/BOE) (151,081) (57,965) (29,749)  
Balance at the end of the period (in Bbls/Mcf/BOE) 11,638,618 11,567,846 10,254,470  
Proved developed reserves (in Bbls/Mcf) 7,670,934 4,986,337 706,053 104,731
Period of acceleration in projected reversion date of working interest resulting in upward revision of proved oil reserves 2 years      
Working interest in proved oil reserves (as a percent) 24.00%      
Crude Oil | Delhi Field
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Improved recovery of proved oil reserves (in Bbls)     9,411,841  
Natural Gas Liquids
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf/BOE) 712,300 1,036,627 1,054,294  
Revisions of previous estimates (in Bbls/Mcf/BOE) (212,677) (84,154) (19,147)  
Improved recovery, extensions and discoveries (in Bbls/Mcf/BOE) 5,461   29,300  
Sales of minerals in place (in Bbls/Mcf/BOE) 0 (221,469)    
Production (sales volumes) (in Bbls/Mcf/BOE) (12,611) (18,704) (27,820)  
Balance at the end of the period (in Bbls/Mcf/BOE) 492,473 712,300 1,036,627  
Proved developed reserves (in Bbls/Mcf) 111,978 100,900 157,302 141,372
Natural Gas
        
Estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves        
Balance at the beginning of the period (in Bbls/Mcf/BOE) 9,403,899 6,762,954 6,358,788  
Revisions of previous estimates (in Bbls/Mcf/BOE) (1,295,893) 3,273,846 430,145  
Improved recovery, extensions and discoveries (in Bbls/Mcf/BOE) 18,925 779,556 381,695  
Sales of minerals in place (in Bbls/Mcf/BOE) 0 (1,173,850)    
Production (sales volumes) (in Bbls/Mcf/BOE) (266,775) (238,607) (407,674)  
Balance at the end of the period (in Bbls/Mcf/BOE) 7,860,156 9,403,899 6,762,954  
Proved developed reserves (in Bbls/Mcf) 1,499,382 1,543,401 1,536,858 1,106,028