Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Stock based compensation by job function [Line Items]
Number of shares available for grant (in shares)	6,800,000		6,800,000
Stock-based compensation expense related to stock options, SAR and ESPP grants	$ 10.5	$ 9.3	$ 19.9	$ 17.8
Share Based Compensation Arrangement By Share Based Payment Award Options And Stock Appreciation Rights Additional Disclosures Abstract [Abstract]
Available for Future Grant (in shares)	6,800,000		6,800,000
Lease And Well [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	7.2	6.0	14.9	12.3
Gathering And Processing Costs [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	0.2	0.3	0.4	0.3
Exploration Costs [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	5.5	5.3	11.6	10.8
General And Administrative [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	13.1	10.9	26.5	21.6
Total [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	26.0	22.5	53.4	45.0
Stock Options And Sars [Member]
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Based Compensation [Abstract]
Weighted Average Fair Value of Grants			$ 36.57	$ 33.38
Expected Volatility (in hundredths)			37.13%	38.05%
Risk-Free Interest Rate (in hundredths)			1.12%	1.21%
Dividend Yield (in hundredths)			0.60%	0.60%
Expected Life (in years)			5.4	5.0
Stock option and SAR Rollforward [Abstract]
Outstanding at January 1			8,445,000	8,335,000
Granted			80,000	91,000
Exercised (1)			(1,016,000)	(724,000)
Forfeited			(99,000)	(56,000)
Outstanding at June 30	7,410,000	7,646,000	7,410,000	7,646,000
Share Based Compensation Arrangement By Share Based Payment Award Options And Stock Appreciation Rights Additional Disclosures Abstract [Abstract]
Outstanding at January 1 - Price per Share			$ 64.49	$ 57.08
Granted - Price Per Share			$ 110.36	$ 103.36
Exercised - Price Per Share (1)			$ 51.11	$ 40.72
Forfeited - Price per Share			$ 87.22	$ 79.22
Outstanding at June 30 - Price per Share	$ 66.51	$ 59.02	$ 66.51	$ 59.02
Stock Options/SARs Exercisable (in shares)	4,510,000	4,750,000	4,510,000	4,750,000
Intrinsic value of stock options/SARs exercised during the year			59.9	45.2
Stock options/SARs vested or expected to vest (in shares)	7,183,000	7,414,000	7,183,000	7,414,000
Weighted average grant price for stock options/SARs vested or expected to vest (per share)	$ 65.84	$ 58.32	$ 65.84	$ 58.32
Intrinsic value of stock options/SARs vested or expected to vest	279.8	298.7	279.8	298.7
Weighted average remaining contractual life of stock options/SARs vested or expected to vest (in years)			3.5	3.8
Aggregate Intrinsic Value For Outstanding Units			283.6	302.7
Weighted Average Remaining Life For Outstanding Units			3.6	3.8
Aggregate Intrinsic Value For Exercisable Units	235.5	251.0	235.5	251.0
Weighted Average Remaining Life For Exercisable Units			2.4	2.9
Unrecognized compensation expense related to non-vested stock option and SAR grants	70.9		70.9
Weighted average period over which unrecognized compensation expense related to stock options and SARs will be recognized (in years)			2.4
Weighted Average Grant Price For Exercisable Units	$ 52.53	$ 45.71	$ 52.53	$ 45.71
Espp [Member]
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Based Compensation [Abstract]
Weighted Average Fair Value of Grants			$ 21.55	$ 24.66
Expected Volatility (in hundredths)			30.26%	34.78%
Risk-Free Interest Rate (in hundredths)			0.18%	0.15%
Dividend Yield (in hundredths)			0.60%	0.70%
Expected Life (in years)			0.5	0.5
Restricted Stock And Restricted Stock Units [Member]
Stock option and SAR Rollforward [Abstract]
Outstanding at January 1			4,009,000	3,636,000
Granted			292,000	251,000
Exercised (1)			(213,000)	(206,000)
Forfeited			(97,000)	(44,000)
Outstanding at June 30	3,991,000	3,637,000	3,991,000	3,637,000
Share Based Compensation Arrangement By Share Based Payment Award Options And Stock Appreciation Rights Additional Disclosures Abstract [Abstract]
Outstanding at January 1 - Price per Share			$ 79.13	$ 73.69
Granted - Price Per Share			$ 106.14	$ 95.95
Exercised - Price Per Share (1)			$ 69.29	$ 49.46
Forfeited - Price per Share			$ 80.09	$ 76.23
Outstanding at June 30 - Price per Share	$ 81.61	$ 76.57	$ 81.61	$ 76.57
Stock-based compensation expense related to restricted stock and restricted stock units	15.5	13.2	33.5	27.2
Intrinsic value of restricted stock and restricted stock units released during the year			22.6	20.4
Aggregate Intrinsic Value of Restricted Stock And Restricted Stock Units			417.3	357.7
Unrecognized compensation expense related to restricted stock and restricted stock units			$ 136.2
Weighted average period over which unrecognized compensation expense related to restricted stock and restricted stok units will be recognized (in years)			2.5

The total dollar difference between fair values of the underlying shares reserved for issuance and the grant price of in-the-money stock options and SARs as of the balance-sheet date.

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The aggregate intrinsic value of restricted stock and restricted stock units outstanding as of the balance sheet date.

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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).

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The weighted average period over which unrecognized share-based restricted stock compensation costs are expected to be reported.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options and SARs outstanding.

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Aggregate intrinsic value of restricted stock and restricted stock units released to grantees.

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Share-based compensation cost during the period with respect to restricted (non-vested) stock and/or restricted stock units, which has been recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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The weighted average grant-date fair value of options, SARs and ESPP grants during the reporting period as calculated by applying the disclosed option pricing methodology.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options and stock appreciation rights that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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The number of shares into which fully or partially vested stock options and stock appreciation rights outstanding as of the balance-sheet date can be currently converted under the option plan.

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The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options and stock appreciation rights under the plan.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options and stock appreciation rights which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average price at which option holders acquired shares when converting their stock options and stock appreciation rights into shares under the plan during the reporting period.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option and stock appreciation rights under the plan.

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The quantity of shares issuable on stock option and stock appreciation awards under the plan during the reporting period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options and stock appreciation rights awarded under the plan during the reporting period.

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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.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option and stock appreciation right plan.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options and SARs outstanding can be converted under the option plan.

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The weighted-average grant price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options and SARs currently exercisable under the share based compensation plan.

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As of the balance sheet date, the weighted-average grant price for outstanding stock options and SARs that are fully vested or expected to vest.

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The weighted-average period between the balance-sheet date and expiration date for fully vested and expected to vest options and SARs outstanding, which may be expressed in a decimal value for number of years.

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The weighted average remaining life of the outstanding, exercisable stock options and SARs as of the balance-sheet date for all option plans in the customized range of exercise prices.

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The weighted-average period remaining as of the balance-sheet date until option expiration pertaining to the outstanding stock options and SARs for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

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This element represents the amount of recognized share-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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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.

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As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The weighted average period over which unrecognized share-based compensation costs are expected to be reported.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(a)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2

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The estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(d)

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The difference between the maximum number of shares authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares already issued upon exercise of options or other share-based awards under the plan, and 2) shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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