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Supplemental Information on Oil and Natural Gas Producing Activities - Standardized Measure of Discounted Future Cash Flows (Unaudited) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Standardized Measure [Abstract]      
Future cash inflows from production $ 29,482,544 $ 26,494,942 $ 23,564,771
Future production costs (8,899,465) (7,392,104) (8,218,860)
Future development costs (4,021,051) [1] (2,977,993) [1] (3,779,761) [1]
Future income tax expenses (3,721,509) (4,043,953) (2,392,464)
Undiscounted future net cash flows 12,840,519 12,080,892 9,173,686
10% annual discount (7,000,151) (6,864,555) (5,490,171)
Standardized measure of discounted future net cash flows $ 5,840,368 [2] $ 5,216,337 [2] $ 3,683,515 [2]
[1] Includes abandonment costs.
[2] Includes approximately $952.7 million and $932.8 million attributable to noncontrolling interests at December 31, 2012 and 2011, respectively.