Amendment Flag
Current Fiscal Year End Date
Document Period End Date
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Current Reporting Status
Entity Filer Category
Entity Public Float
Entity Registrant Name
Entity Central Index Key
Entity Common Stock, Shares Outstanding
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Type
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis]
Summary of Significant Accounting Policies [Abstract]
Accounts Receivable, Net
Accounts Receivable, Net, Current
Accounts Payable
Accounts Payable, Current
Less: Accumulated Depreciation, Depletion and Amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Accumulated Other Comprehensive Income
Additional Paid in Capital
Items Not Requiring (Providing) Cash
Compensation expense related to the company's stock-based compensation plans
Stock-based compensation expense related to stock options, SAR and ESPP grants
Antidilutive Stock Options and SARs excluded from Diluted Earnings Per Share Calculation
Carrying Amount at Beginning of Period
Carrying Amount at End of Period
Asset Retirement Obligation
Accretion
Current Portion
Noncurrent Portion
Foreign Currency Translations
Liabilities Incurred
Asset Retirement Obligations [Abstract]
Liabilities Settled (1)
Asset Retirement Obligations [Text Block]
Revisions
ASSETS
Assets [Abstract]
Total
Assets, Current
Total Assets
Total Assets
Assets
Financial Assets:
Derivatives, Fair Value, by Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Accrued Capital Expenditures
Additions Pending the Determination of Proved Reserves
Exploratory Well Costs [Abstract]
Capitalized exploratory well costs that have been capitalized for a period greater than one year
Costs Charged to Expense (1)
Capitalized Exploratory Well Cost, Charged to Expense
Balance at December 31, 2012
Balance at March 31, 2013
Capitalized Exploratory Well Costs
Capitalized exploratory well costs that have been capitalized for a period less than one year
Cash and Cash Equivalents
Cash and Cash Equivalents at Beginning of Period
Cash and Cash Equivalents at End of Period
Cash and Cash Equivalents, at Carrying Value
Current Assets
Increase (Decrease) in Cash and Cash Equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Supplemental Cash Flow Information [Text Block]
Commercial Paper [Member]
Commitments and Contingencies [Text Block]
Commitments and Contingencies (Note 8)
Common Stock, $0.01 Par, 640,000,000 Shares Authorized and 272,366,287 Shares Issued at March 31, 2013 and 271,958,495 Shares Issued at December 31, 2012
Common Stock, Shares Issued
Common Stock, Shares, Issued
Dividends Declared per Common Share
Common Stock, Dividends, Per Share, Declared
Common Stock, Par Value
Common Stock, Shares Authorized
Pension and Postretirement Benefits [Abstract]
Comprehensive Income
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Operating Expenses
Cost of Revenue [Abstract]
Total
Costs and Expenses
Aggregate Principal Amount of Current and Long-Term Debt
Long-term Debt, Gross
Debt Instrument Table [Table]
Fair Value of Debt
Debt Instrument [Axis]
Debt Instrument Issuance Face Amount
Debt Instrument, Face Amount
Debt Instrument, Name [Domain]
Debt Instrument Issuance Interest Rate
Debt Instrument, Interest Rate, Stated Percentage
Deferred Income Taxes
Deferred Income Tax Expense (Benefit)
Deferred Income Taxes
Deferred Income Taxes
Deferred Tax Liabilities, Net, Noncurrent
Deferred Income Taxes
Deferred Tax Liabilities, Net, Current
Depreciation, Depletion and Amortization
Liabilities from Price Risk Management Activities
Derivative Liabilities, Current
Derivatives, Fair Value, by Derivative Instrument Risk [Axis]
Collateral Held on Derivative
Financial Assets: Crude Oil Swaps
Derivative [Line Items]
Risk Management Activities [Text Block]
Assets from Price Risk Management Activities
Derivatives Assets, Current
Derivative Assets, Current
Derivative [Table]
Risk Management Activities [Abstract]
Derivative Collateral [Abstract]
Other Liabilities
Derivative Liabilities, Noncurrent
Derivative, by Nature [Axis]
Derivative, Name [Domain]
Derivative Contract Type [Domain]
Derivatives, Fair Value [Line Items]
Schedule of Share Based Compensation Arrangement By Share Based Payment Award
Stock-Based Compensation [Abstract]
Divestitures [Abstract]
Divestitures [Text Block]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Quarterly Cash Dividends Common Stock per Share
Net Income Per Share
Denominator for Basic Earnings per Share - [Abstract]
Earnings Per Share, Basic [Abstract]
Diluted
Diluted
Earnings Per Share, Diluted
Average Number of Common Shares
Numerator for Basic and Diluted Earnings per Share - [Abstract]
Earnings Per Share, Basic and Diluted [Abstract]
Basic
Basic
Earnings Per Share, Basic
Net Income Per Share [Text Block]
Net Income Per Share [Abstract]
Effect of Exchange Rate Changes on Cash
Stock based compensation by job function [Line Items]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain]
Unrecognized compensation expense related to non-vested stock option and SAR grants
Excess Tax Benefits from Stock-Based Compensation
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities
Excess Tax Benefits from Stock-Based Compensation
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities
Exploration Costs
Exploration Expense
Fair Value Measurements [Abstract]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Contingent Consideration
Fair Value Measurements [Text Block]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table]
Financial Liabilities: Foreign Currency Rate Swap
Gains on Asset Dispositions, Net
Gains (Losses) on Sales of Assets
General and Administrative
Impairments
Income Tax Provision
Income Tax Expense (Benefit)
Income Taxes, Net of Refunds Received
Income Taxes Receivable
Income Taxes Receivable, Current
Accrued Taxes Payable
Increase (Decrease) in Accrued Taxes Payable
Accounts Payable
Increase (Decrease) in Accounts Payable
Changes in Components of Working Capital and Other Assets and Liabilities
Other Assets
Increase (Decrease) in Other Operating Assets
Inventories
Increase (Decrease) in Inventories
Other Liabilities
Increase (Decrease) in Other Operating Liabilities
Accounts Receivable
Increase (Decrease) in Receivables
Stock Options/SARs
Interest Costs Capitalized
Interest Expense, Net
Interest Expense
Interest Expense
Interest Expense [Abstract]
Financial Liabilities: Interest Rate Swap
Interest (1)
Interest Paid, Net
Interest Rate Swap [Member]
Interest Rate Derivative [Abstract]
Total
Liabilities, Current
Current Liabilities
Liabilities, Current [Abstract]
Financial Liabilities:
Total Liabilities and Stockholders' Equity
Liabilities and Equity
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Line of Credit Facility, Lender [Domain]
Line of Credit Facility, Expiration Date
Line of Credit Facility, Expiration Date
Line of Credit Facility [Axis]
Line of Credit Facility [Line Items]
Line of Credit Facility [Table]
Long-Term Debt [Text Block]
Long-term Debt [Text Block]
Current Portion of Long-Term Debt
Long-Term Debt
Long-term Debt, Excluding Current Maturities
Natural Gas
Financing Cash Flows
Net Cash Used in Investing Activities
Net Cash Used in Financing Activities
Investing Cash Flows
Cash Flows from Operating Activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income
Net Income
Net Income (Loss) Attributable to Parent
Net Cash Provided by Operating Activities
Net Cash Provided by (Used in) Operating Activities
Interest Rate Swap, Notional Amount
Oil and Gas Properties (Successful Efforts Method)
Crude Oil and Condensate
Operating Income
Operating Income (Loss)
Operating Income (Loss)
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Net of Tax
Other, Net
Other Noncash Income (Expense)
Other
Other Assets, Current
Other Assets
Other Assets, Noncurrent
After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From The Foreign Currency Swap
Foreign Currency Translation Adjustments
Other
Other Liabilities, Current
Other Income (Expense), Net
Other Liabilities
Other Liabilities, Noncurrent
Other Liabilities [Member]
Treasury Stock Purchased
Payments for Repurchase of Common Stock
Additions to Oil and Gas Properties
Payments to Acquire Oil and Gas Property and Equipment
Dividends Paid
Payments of Ordinary Dividends
Additions to Other Property, Plant and Equipment
Payments to Acquire Other Property, Plant, and Equipment
Pension and Postretirement Benefits [Text Block]
Total pension plan costs
Other, Net
Proceeds from (Payments for) Other Financing Activities
Proceeds from Sales of Assets
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan
Number of exploratory wells that have been capitalized for a period greater than one year
Property, Plant and Equipment
Property, Plant and Equipment, Net [Abstract]
Other Property, Plant and Equipment
Property, Plant and Equipment, Other, Gross
Total Property, Plant and Equipment, Net
Property, Plant and Equipment, Net
Total Property, Plant and Equipment
Property, Plant and Equipment, Gross
Reclassifications to Proved Properties
Assets by Reportable Segment
Repayment of Capital Lease Obligation
Share Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost
Dry Hole Costs
Retained Earnings
Retained Earnings (Accumulated Deficit)
Total
Net Operating Revenues
Revenues
Net Operating Revenues
Revenues [Abstract]
Aggregate Intrinsic Value For Exercisable Units
Average Borrowings Outstanding
ESPP Activity
Aging of Capitalized Exploratory Well Costs
Fair Value Assets and Liabilities Measured On Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Asset Retirement Obligation Rollforward Analysis
Net Cash Paid For Interest and Income Taxes
Weighted Average Fair Values and Valuation Assumptions
Restricted Stock and Restricted Stock Unit Transactions
Computation of Net Income Per Share
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis]
Schedule Of Employee Service Share-Based Compensation, Allocation Of Recognized Period Costs [Table]
Estimated Future Employer-Paid Benefits
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Commodity Derivative Contracts - Crude Oil
Schedule of Derivative Instruments [Table Text Block]
Stock Options and SARs Transactions
Selected Information [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Selected Financial Information by Reportable Segment
Schedule of Derivative Instruments In Statement Of Financial Position, Fair Value
Selected Information [Line Items]
Schedule of Segment Reporting Information By Segment [Abstract]
Segment Information
Segment Information [Domain]
Weighted Average Grant Price Restricted Stock and Restricted Stock Units Rollforward [Abstract]
Restricted Stock and Restricted Stock Unit [Roll Forward]
Stock-Based Compensation Expenses
Share-based Compensation
Forfeited - Price per Share
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized
Granted
Granted - Price Per Share
Exercised - Price Per Share
Risk-Free Interest Rate (in hundredths)
Expected Volatility (in hundredths)
Stock Options/SARs Exercisable at March 31 (price per share)
Dividend Yield (in hundredths)
Weighted Average Fair Value of Grants
Intrinsic value of stock options/SARs exercised during the period
Stock Options/SARs Exercisable at March 31 (in shares)
Common Shares Available for Grant
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Stock Options and SARs Rollforward [Abstract]
Forfeited
Stock options/SARs vested or expected to vest (in shares)
Outstanding at January 1 - Price per Share
Outstanding at March 31 - Price per Share
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Aggregate Intrinsic Value For Outstanding Options and SARs
Aggregate Intrinsic value of stock options/SARs vested or expected to vest
Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain]
Weighted average grant price for stock options/SARs vested or expected to vest (price per share)
Summary of Significant Accounting Policies [Text Block]
Consolidated Statements of Cash Flows [Abstract]
Segment Information [Axis]
Exercised (1)
Stockholders' Equity
Total Stockholders' Equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Supplemental Cash Flow Information [Abstract]
Exploratory Well Costs [Text Block]
Accrued Taxes Payable
Taxes Payable, Current
Common Stock Held in Treasury, 308,010 Shares at March 31, 2013 and 326,264 Shares at December 31, 2012
Common Stock Held in Treasury, Shares
Treasury Stock, Shares
Total (Losses) Gains
(Losses) Gains on Mark-to-Market Commodity Derivative Contracts
Unrealized Gain (Loss) on Derivatives and Commodity Contracts
Mark-to-Market Commodity Derivative Contracts
Potential Dilutive Common Shares -[Abstract]
Weighted Average Shares
Basic
Weighted Average Number of Shares Outstanding, Basic
Diluted
Adjusted Diluted Weighted Average Shares
Canada [Member]
Trinidad [Member]
United States [Member]
Notes To Financial Statements [Abstract]
Revenue from the sale of natural gas liquids.
Natural Gas Liquids
Revenues related to sales of third-party natural gas, crude oil and condensate and natural gas liquids, and gathering fees associated with gathering third-party natural gas.
Gathering, Processing and Marketing
The total amount of net operating revenues, not previously categorized.
Other, Net
Other, Net
Costs to operate and maintain natural gas and crude oil wells, cost of workovers and lease and well administrative expenses.
Lease and Well
Costs associated with the delivery of hydrocarbon products from the lease to a downstream point of sale.
Transportation Costs
Operating and maintenance expenses and administrative expenses associated with operating gathering and processing assets.
Gathering and Processing Costs
Costs of purchasing third-party natural gas and crude oil and the related transportation costs.
Marketing Costs
Taxes other than income taxes, if not included elsewhere, could include, property tax or other selling and distribution-related taxes.
Taxes Other Than Income
Income Before Interest Expense and Income Taxes.
Income Before Interest Expense and Income Taxes
Income Before Interest Expense and Income Taxes
Sum of operating profit and nonoperating income (expense) before income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.
Income Before Income Taxes
Income Before Income Taxes
Income Before Income Taxes
Comprehensive Income (Loss)
Statement Of Comprehensive Income [Abstract]
Comprehensive Income
The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.
Net Income Loss Relating To Comprehensive Income
Net Income
Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)
Change in fair value of foreign currency swap transaction accounted for using the hedge accounting method.
Foreign Currency Swap Transaction
Foreign Currency Swap Transaction
The tax effect of the foreign currency swap transaction.
Income Tax Related To Foreign Currency Swap Transaction
Income Tax Related to Foreign Currency Swap Transaction
Change in fair value of interest swap transaction accounted for using the hedge accounting method.
Interest Swap Transactions
Interest Rate Swap Transaction
The tax effect of the interest swap transaction.
Income Tax Related to Interest Swap Transactions
Income Tax Related to Interest Rate Swap Transaction
Other Comprehensive Income including defined benefit plans adjustments before tax portion attributable to parent and the income tax related to defined benefit pension and postretirement plans.
Other
Consolidated Balance Sheets [Abstract]
Carrying amount as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).
Inventories
Inventories
Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. For classified balance sheets, used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer); for unclassified balance sheets, used to reflect the total liabilities (regardless of due date).
Dividends Payable Total
Dividends Payable
Common Stock
Common Stock
Common Stock
Treasury Stock
Treasury Stock
Treasury Stock
The net gain or loss resulting from the sale, transfer, termination, or other disposition of assets during the period, excluding transactions involving capital leases, assets-held- or available-for-lease, and other real estate owned which, to the extend appropriate, are included in gains (losses) on the disposition of assets in nonoperating income (expense).
Gains Losses On Property Dispositions, Net
Gains on Asset Dispositions, Net
This element reflects realized gain (loss) on the settlement of financial commodity derivative instruments.
Realized Gains (Losses)
Realized Gains
The cash inflows/outflows from operating activities not classfied elsewhere.
Other, Net Excluding Gains Losses
Other, Net
The net change during the reporting period of all current assets and liabilities used in investing and financing activities.
Changes in Components of Working Capital Associated with Investing and Financing Activities
The net change during the reporting period of all current assets and liabilities used in investing and financing activities.
Changes in Components of Working Capital Associated with Investing Activities
Changes in Components of Working Capital Associated with Investing Activities
Description containing the entire pension and other postretirement benefits disclosure and share-based payment (SFAS 123R) disclosure as a single block of text.
Pension And Postretirement Benefits Disclosure And Stock Based Compensation Disclosure [TextBlock]
Stock-Based Compensation [Text Block]
Name or caption of a line item on the balance sheet or income statement which was increased or decreased by share-based compensation costs during the period. Specifically, the Lease and Well category.
Lease And Well [Member]
Name or caption of a line item on the balance sheet or income statement which was increased or decreased by share-based compensation costs during the period. Specifically, the Gathering and Processing Costs category.
Gathering And Processing Costs [Member]
Name or caption of a line item on the balance sheet or income statement which was increased or decreased by share-based compensation costs during the period. Specifically, the Exploration cost category.
Exploration Costs [Member]
Name or caption of a line item on the balance sheet or income statement which was increased or decreased by share-based compensation costs during the period. Specifically, the General and Administrative category.
General And Administrative [Member]
Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding
Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding
Weighted average remaining contractual term of exercisable stock options.
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercisable Options, Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Life for Exercisable Options and SARs (in years)
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans.
Employee Service Share-based Compensation, Nonvested Awds, Total Compensation Cost Not yet Recognized, Period for Recognition
Weighted average period over which unrecognized compensation expense will be recognized (in years)
Performance Shares
Performance Units and Performance Stock [Member]
Stock options and stock-settled stock appreciations rights (SARS)
Stock Options And Sars [Member]
Employee Stock Purchase Plan
Espp [Member]
Restricted Stock and Restricted Stock Units
Restricted Stock And Restricted Stock Units [Member]
The intrinsic value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology.
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments for Restricted Stock and Restricted Units Other than Options, Nonvested, Intrinsic Value
Intrinsic value of restricted stock and restricted stock units released during the year
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Based Compensation [Abstract]
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Options/SARs, ESPP, and Performance Units/Stock Stock Based Compensation [Abstract]
Expected term of share-based compensation awards represents the reported fact of one year, five months, and thirteen days.
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Life
Expected Life (in years)
The number of shares reserved for issuance under stock option and stock appreciation right agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.
Share Based Compensation Arrangement By Share Based Payment Award Options And Stock Appreciation Rights Outstanding Number
Outstanding at January 1
Outstanding at March 31
Share Based Compensation Arrangement By Share Based Payment Award Options And Stock Appreciation Rights Additional Disclosures Abstract [Abstract]
Share Based Compensation Arrangement By Share Based Payment Award Stock Option/SAR [Abstract]
Weighted average remaining contractual life for stock options/SARs vested or expected to vest.
Weighted Average Remaining Contractual Life for Stock Options/SARs Vested or Expected to Vest
The number of outstanding awards of restricted stock and nits for which the employer is contingently obligated to issue equity instruments to a grantee who has not yet satisfied service criteria necessary under the agreement.
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock And Restricted Stock Units Nonvested Number
Outstanding at January 1
Outstanding at March 31 (2)
The aggregate number of restricted (non-vested) stock shares or restricted stock units granted during the period
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock And Restricted Stock Units Grants In Period
Granted
The aggregate number of restricted (non-vested) stock shares or restricted stock units released to grantees during the period.
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock And Restricted Stock Units Vested In Period
Released (1)
The aggregate number of restricted (non-vested) stock shares or units forfeited during the period due to the failure to satisfy vesting conditions.
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock And Restricted Stock Units Forfeited In Period
Forfeited
As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based restricted stock compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met).
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Restricted Stock Awards
The weighted average period over which unrecognized share-based restricted stock compensation costs are expected to be reported.
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Restricted Stock Awards Weighted Average Period Of Recognition
Performance Units and Performance Stock
Performance Units and Performance Stock [Abstract]
Performance Units Granted
Performance Units Granted
Performance Stock Granted
Performance Stock Granted
The noncash expense that represents the cost of performance units and stocks distributed to employees as compensation.
Share Based Compensation Arrangement By Performance Units and Stock Compensation Cost
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Performance Units and Stock Awards
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Performance Units and Stock Awards
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Performance Units and Stock Awards Weighted Average Period of Recognition
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Performance Units and Stock Awards Weighted Average Period Of Recognition
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Performance Units and Stock Awards Weighted Average Period Of Recognition
The grant date weighted average fair value of restricted (non-vested) stock and unit awards for which the employer is contingently obligated to issue equity instruments or transfer assets to a grantee who has not yet satisfied service criteria under the agreement.
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock And Restricted Stock Units Nonvested Weighted Average Grant Date Fair Value
Outstanding at January 1 - Price per Share
Outstanding at March 31 - Price per Share
Average fair value of restricted stock shares and units granted during the period.
Share Based Payment Award Restricted Stock And Unit Average Grant Price
Granted - Price per Share
Average fair value of restricted stock shares and units released to grantees during the period
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Releases In Period Weighted Average Grant Date Fair Value
Released - Price per Share
Average fair value of restricted stock shares and units forfeited by grantees during the period
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Option Forfeited In Period Weighted Average Grant Date Fair Value
Forfeited - Price per Share
The aggregate intrinsic value of restricted stock and restricted stock units outstanding as of the balance sheet date.
Aggregate Intrinsic Value Of Restricted Stock And Restricted Stock Units
Aggregate Intrinsic Value Of Restricted Stock And Restricted Stock Units Outstanding
Aggregate awards of share options and nonvested shares to be issued under a share-based compensation arrangement are considered options for purposes of diluted earnings per share (DEPS). Share-based awards considered outstanding at grant date when computing DEPS although exercise may be vesting contingent. Share-based awards are included in DEPS computation even if employee may not receive (or sell) the stock until future date. All shares to be issued shall be included in computing DEPS, if dilutive.
Incremental Common Shares Attributable To Share Based Payment Arrangements Nonvested Stock And Units
Restricted Stock/Units and Performance Units/Stock
Denominator For Diluted Earnings Per Share [Abstract]
Denominator for Diluted Earnings per Share - [Abstract]
Net Income Loss Available To Common Stockholders [Abstract]
Net Income Per Share [Abstract]
Other International [Member]
The net amount of other nonoperating income and expense (other than interest), which does not qualify for separate disclosure on the income statement under materiality guidelines.
Other Nonoperating Income Expense Excluding Interest
Other Income (Expense), Net
The cost of borrowed funds accounted for as interest that was charged against earnings during the period.
Interest Expense, Net
Interest Expense, Net
This summarizes the net changes in the suspended well costs.
Net Changes In Suspended Well Costs
Net Changes In Capitalized Exploratory Well Costs
Additions or deductions to capitalized exploratory well costs that resulted from changes in foreign currency exchange rates.
Capitalized Exploratory Well Cost Foreign Currency Translations
Foreign Currency Translations
The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling related to an outside operated, offshore Central North Sea project in the United Kingdom
Costs Related To Outside Operated Offshore Central North Sea Projects In United Kingdom
Exploratory well costs related to an outside operated, offshore Central North Sea project in the United Kingdom
The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling related to a project in Central Alberta, Canada..
Costs Related To A Project In Central Alberta, Canada
Exploratory well costs related to a project in Central Alberta, Canada
Schedule of Defined Benefit and Defined Contribution Plans Disclosures [Table]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Defined Benefit and Defined Contribution Plan Disclosure [Line Items]
Floating Rate Senior Notes Due 2014 [Member]
Floating Rate Senior Notes due 2014 [Member]
Subsidiary Debt Due 2014 [Member]
4.75% Subsidiary Debt due 2014 [Member]
Debt Instrument Table [Line Items]
The reference rate for the variable rate of the floating rate debt, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR
Floating Rate Debt Description Of Variable Rate Basis
Variable Rate Basis
Debt Instrument Issuance [Abstract]
Revolving Credit Agreement 2011 [Member]
Revolving Credit Agreement [Member]
Reflects the calculation for the reporting period of the average interest rate on comemrcial paper weighted by the amount of commercial paper outstanding for varing time periods during the period.
Short Term Debt Weighted Average Interest Rate Commercial Paper
Weighted average interest rate (in hundredths)
The effective Eurodollar interest rate at the end of the reporting period.
Eurodollar Rate At Period End
Eurodollar rate at period end (in hundredths)
The effective base interest rate at the end of the reporting period.
Base Rate At Period End
Base rate at period end (in hundredths)
Fair Value Assets And Liabilities Measured On Recurring Basis [Table]
Fair Value Assets And Liabilities Measured On Recurring Basis Disclosure Items [Axis]
Fair Value Assets And Liabilities Measured On Recurring Basis [Domain]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Financial commodity price swap contract which provides the counterparty option to enter into a price swap contract at a later date.
Natural Gas Swaptions
Financial Assets: Crude Oil Options/Swaptions
Financial Assets: Natural Gas Options/Swaptions
Financial Liabilities: Crude Oil Options/Swaptions
Financial Liabilities: Natural Gas Options/Swaptions
Net dollar amount capitalized on balance sheet representing an enterprise's interests in proved crude oil (including condensate and natural gas liquids) and/or natural gas properties.
Proved Oil And Gas Property Carrying Amount
Proved Oil and Gas Property and Other Assets Carrying Amount
Fair value of proved oil and gas property and other property, plant and equipment as of the balance sheet date.
Proved Oil And Gas Property Fair Value
Proved and Unproved Oil and Gas Properties and Other Property, Plant and Equipment Written Down During the Period - Fair value at End of Period
The expense recorded to reduce the value of oil and gas assets consisting of proved properties as the estimate of future successful production from these properties is reduced.
Impairment Charge for Shallow Natural Gas Assets Sold in Canada
Pretax Impairment Charge for Proved Oil and Gas Properties and Other Property, Plant and Equipment
Derivative contracts table
Derivative Contracts Table - Natural Gas [Text Block]
Commodity Derivative Contracts - Natural Gas
Crude Oil Derivative Contracts January [Member]
Crude Oil Derivative Contracts January (closed) [Member]
Natural Gas Derivative Contracts January - April (closed) [Member]
Natural Gas Derivative Contracts January - April (closed) [Member]
Natural Gas Derivative Contracts May - December [Member]
Natural Gas Derivative Contracts May - December [Member]
Natural Gas Derivative Contracts Year Three January - December [Member]
Natural Gas Derivative Contracts Year Two January - December [Member]
Crude Oil Derivative Contracts April [Member]
Primary financial statement caption in which the reported facts about other current liabilities has been included. Other current liabilities is the aggregate of current liabilities not separately disclosed in the balance sheet. Current liabilities are expected to be realized or consumed within one year or the normal operating cycle, if longer.
Other Current Liabilities [Member]
Crude Oil Derivative Contracts February - March (closed) [Member]
Crude Oil Derivative Contracts July - December [Member]
Crude Oil Derivative Contracts July - December [Member]
Aggregate notional amount of derivative expressed in nonmonetary units. For example the number of barrels specified in a forward purchase contract.
Derivative Nonmonetary Notional Amount Natural Gas
Volume (MMBtud)
Aggregate notional amount of derivative expressed in nonmonetary units. For example the number of barrels specified in a forward purchase contract.
Derivative Nonmonetary Notional Amount Crude Oil
Volume (Bbld)
Aggregate notional volumes associated with swaption contracts.
Volumes (MMBtud) - Swaption Contracts
Volumes (MMBtud) - Derivative Option Contracts
Derivative instrument average price per unit
Average Price MMBtu Swaption Contracts
Average Price ($/MMBtu) - Derivative Option Contracts
The weighted average price for a series of crude oil derivative contracts.
Derivative Weighted Average Price Crude Oil
Derivative Weighted Average Price Crude Oil ($/Bbl)
The weighted average price for a series of natural gas derivative contracts.
Derivative Weighted Average Price Natural Gas
Derivative Weighted Average Price Natural Gas ($/MMBtu)
Aggregate notional volumes associated with derivative contracts.
Volumes (Bbld) - Derivative Option Contracts
Derivative instrument average price per unit.
Average Price ($/Bbl) - Derivative Option Contracts
Crude Oil Derivative Contracts May - June [Member]
Crude Oil Derivative Contracts May - July [Member]
Crude Oil and Natural Gas Derivative Contracts [Member]
Foreign Currency Swap [Member]
Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included.
Liabilities From Price Risk Management Activities [Member]
Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included.
Assets From Price Risk Management Activities [Member]
Foreign Currency Exchange Rate Derivative [Abstract]
The after-tax net impact from the interest rate swap that is included in Other Comprehensive Income.
After-tax net impact from interest rate swap
After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From Interest Rate Swap
Estimated proceeds from the sale of producing properties and acreage.
EstimatedProceedsFromSalesOfProducingPropertiesAndAcreage
Proceeds from Sales of Producing Properties and Acreage
The value of all consideration received by the Entity in the sale of Canadian shallow natural gas assets.
Proceeds From Sale of Canadian Shallow Gas Assets
Proceeds received on sale of Canadian shallow gas assets
Crude Oil Derivative Contracts Year Two January - December [Member]
Estimated Acreage From Sales of Producing Properties And Acreage
Estimated Acreage From Sales of Producing Properties And Acreage
Crude Oil Derivative Contracts Year Two January - June [Member]
Crude Oil Derivative Contracts Year Two July - December [Member]
Gross current derivative assets.
Derivative Assets, Current, Gross
Gross noncurrent derivative assets.
Derivative Assets, Noncurrent, Gross
Gross current derivative liabilities.
Derivative Liabilities, Current, Gross
Gross noncurrent derivative liabilities.
Derivative Liabilities, Noncurrent, Gross
Document and Entity Information [Abstract]