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Debt - Revolving Credit Facility Narrative (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Apr. 08, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  | $ 10,405 |  | $ 10,692
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 9,425 |  | $ 9,706
Interest expense on senior notes |  |  |  |  |  |  |  |  | 115 | $ 171 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Borrowing Capacity, Description |  |  |  | (i) the suspension or modification of certain financial covenants and (ii) the granting of liens and security interests on substantially all of our assets, including mortgages encumbering 90% of our proved oil and gas properties that constitute borrowing base properties, all hedge contracts and personal property, subject to certain agreed upon carve outs |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  | 367 |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  | 619 |  |
Borrowing capacity |  |  |  |  |  |  |  |  | 4,000 |  |
Revolving Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Coverage Ratio | 1.25 to 1.0 |  |  |  |  |  |  | 1.1 to 1.0 |  |  |
Amended Interest Coverage Ratio |  | 1.25 to 1.0 | 1.1 to 1.0 |  | 1.25 to 1.0 | 1.2 to 1.0 | 0.70 to 1.0 | 0.65 to 1.0 |  |  |
Minimum liquidity requirement when covenant ratio is above 1.1 to 1.0 |  |  |  |  |  | $ 500 |  |  |  |  |
Minimum liquidity requirement when covenant ratio is below 1.1 to 1.0 |  |  | $ 750 |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  | $ 4,000 |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms |  |  |  | The amendment reduces the interest coverage ratio from 1.1 to 1.0 to 0.65 to 1.0 through the first quarter of 2017, after which it will increase to 0.70 to 1.0 through the second quarter of 2017, 1.2 to 1.0 through the third quarter of 2017 and 1.25 to 1.0 thereafter. The amendment also includes a collateral value coverage test whereby if the collateral value coverage ratio, tested as of December 31, 2016, falls below 1.1 to 1.0, the $500 million minimum liquidity covenant increases to $750 million, and if the collateral value coverage ratio, tested as of March 31, 2017, falls below 1.25 to 1.0, our borrowing ability will be reduced in order to satisfy such ratio. |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] | First Lien [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  | $ 2,500 |  |  |  |  |  |  |
6.75% Senior Notes Due 2019 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Supersedeas Bond |  |  |  |  |  |  |  |  | $ 461 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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- Definition Description of the credit facility's borrowing capacity including discussion of how the borrowing capacity is determined (for example, borrowing capacity based on the amount of current assets). + 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(13)) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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