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Long-Term Debt (Details) (USD $) |  |  | 3 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Line of Credit [Member] | Mar. 31, 2014 5.0% Senior Notes Due 2024 [Member] | May 20, 2013 5.0% Senior Notes Due 2024 [Member] | Mar. 31, 2014 Revolving Credit Facility [Member] | Mar. 31, 2014 Senior Notes [Member] | Dec. 31, 2013 Senior Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 2,500,000,000 |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | 1,300,000,000 |  |  |  |  |
Borrowing Base, Line of Credit |  |  | 2,200,000,000 |  |  |  |  |
Percentage of Proved Oil and Gas Properties Secured for Credit Facility Borrowing |  |  |  |  |  | 75.00% |  |
Line of Credit, Covenant Compliance, Maximum Annual Dividend Payment |  |  | 50,000,000 |  |  |  |  |
Debt Instrument, Covenant Compliance, Dividends Excluded From Computation |  |  |  | 6,500,000 |  |  |  |
Interest rate on notes (as a percent) |  |  |  |  | 5.00% |  |  |
Debt Instrument, Face Amount |  |  |  |  | 500,000,000 |  |  |
6.625% Senior Notes, Due 2019 |  |  |  |  |  |  | 350,000,000 | 350,000,000
6.50% Senior Notes, Due 2021 |  |  |  |  |  |  | 350,000,000 | 350,000,000
6.50% Senior Notes, Due 2023 |  |  |  |  |  |  | 400,000,000 | 400,000,000
5% Senior Notes, Due 2024 |  |  |  |  |  |  | 500,000,000 | 500,000,000
Senior Notes | $ 1,600,000,000 | $ 1,600,000,000 |  |  |  |  | $ 1,600,000,000 | $ 1,600,000,000

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- Definition Carrying value as of the balance sheet date of 6.50% Notes due 2021 with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of 6.50% Notes due 2021 with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of 6.625% Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References No definition available. + Details
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- Definition Value of assets pledged as collateral under line of credit agreement, net of certain company liabilities + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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