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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May. 02, 2016 | Apr. 08, 2016 | Mar. 31, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Aug. 31, 2017 | May. 31, 2017 | Jan. 31, 2017 | Dec. 31, 2014
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of oil and natural gas properties |  |  |  | $ 853 | $ 4,976 |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  |  | (921) | (5,092) |  |  |  |  |  |  |
Cash and cash equivalents ($1 and $1 attributable to our VIE) |  |  | $ 16 | 16 | $ 2,907 |  | $ 825 |  |  |  |  | $ 4,108
Working Capital (Deficit) |  |  | (1,341) | (1,341) |  |  | (1,205) |  |  |  |  |
Debt Instrument, Face Amount |  |  | 9,425 | 9,425 |  |  | 9,706 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 878 | 878 |  |  |  |  |  |  |  |
Payments to Acquire Productive Assets |  |  |  |  |  |  | 3,600 |  |  |  |  |
Long-term Debt, Gross |  |  | 10,405 | 10,405 |  |  | 10,692 |  |  |  |  |
Senior Notes [Member] | 6.25% Euro-Denominated Senior Notes Due 2017 [ Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 344 | $ 344 |  |  | 329 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.25% | 6.25% |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 344 | $ 344 |  |  | 329 |  |  |  |  |
Senior Notes [Member] | 3.25% Senior Notes due 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 0 | $ 0 |  |  | 381 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.25% | 3.25% |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 0 | $ 0 |  |  | 381 |  |  |  |  |
Senior Notes [Member] | 2.5% Contingent Convertible Senior Notes due 2037 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 902 | $ 902 |  |  | 1,110 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.50% | 2.50% |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 846 | $ 846 |  |  | 1,027 |  |  |  |  |
Senior Notes [Member] | 6.5% Senior Notes Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 379 | $ 379 |  |  | 453 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.50% | 6.50% |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 379 | $ 379 |  |  | $ 453 |  |  |  |  |
Senior Notes [Member] | 6.75% Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.775% | 6.775% |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  | $ 4,000 | $ 4,000 |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 367 | $ 367 |  |  |  |  |  |  |  |
Standard & Poor's, BB- Rating [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Credit Rating |  |  |  | BB- |  |  |  |  |  |  |  |
Standard & Poor's, CC Rating [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Credit Rating |  |  | CC |  |  |  |  |  |  |  |  |
Moody's, Ba3 Rating [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Credit Rating |  |  |  | Ba3 |  |  |  |  |  |  |  |
Moody's, Caa3 Rating [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Credit Rating |  |  | “Caa3 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [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 |  |  |  |  |  |  |  |  |  |
Collateral Posted | $ 247 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Collateral | We have posted the required collateral, primarily in the form of letters of credit and cash, or are otherwise complying with these contractual requests for collateral. |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Senior Notes [Member] | 6.5% Senior Notes Due 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 379 |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Company's Assets, Including Mortgages, Used as Security Interests |  | 90.00% |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  | $ 4,000 |  |  |  |  |  |  |  |  |  |
Cash Collateral for Borrowed Securities | $ 281 |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  |  |  |  |  | $ 1,625 |  |  |  |
Scenario, Forecast [Member] | Senior Notes [Member] | 6.25% Euro-Denominated Senior Notes Due 2017 [ Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 344 |
Scenario, Forecast [Member] | Senior Notes [Member] | 2.5% Contingent Convertible Senior Notes due 2037 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 902 |  |
Scenario, Forecast [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Productive Assets |  |  |  |  |  | $ 1,300 |  |  |  |  |  |
Scenario, Forecast [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Productive Assets |  |  |  |  |  | $ 1,800 |  |  |  |  |  |
Scenario, Forecast [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash Collateral for Borrowed Securities | $ 696 |  |  |  |  |  |  |  |  |  |  |

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