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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Standardized Measure [Abstract]      
Future cash inflows from production $ 19,937,484 $ 29,482,544 $ 26,494,942
Future production costs (6,843,713) (8,899,465) (7,392,104)
Future development costs(1) (2,546,680) [1] (4,021,051) [1] (2,977,993) [1]
Future income tax expenses (2,283,541) (3,721,509) (4,043,953)
Undiscounted future net cash flows 8,263,550 12,840,519 12,080,892
10% annual discount (4,245,939) (7,000,151) (6,864,555)
Standardized measure of discounted future net cash flows(2) $ 4,017,611 [2] $ 5,840,368 [2] $ 5,216,337 [2]
[1] Includes abandonment costs.
[2] Includes approximately $781.6 million, $952.7 million and $932.8 million attributable to noncontrolling interests at December 31, 2013, 2012 and 2011 respectively.