Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Stock based compensation by job function [Line Items]
Common Shares Available for Grant	4,900,000
Stock-based compensation expense related to stock options, SAR and ESPP grants	$ 10.9	$ 9.4
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items]
Aggregate Intrinsic Value For Outstanding Options and SARs	313.3	396.8
Aggregate Intrinsic Value For Exercisable Units	239.1	305.8
Weighted Average Remaining Life For Exercisable Options and SARs	2.2	2.6
Unrecognized compensation expense related to non-vested stock option and SAR grants	79.8
Weighted average period over which unrecognized compensation expense will be recognized (in years)	2.6
Share Based Compensation Arrangement By Share Based Payment Award ESPP [Abstract]
Available for Future Grant (in shares)	4,900,000
Share Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost	17.4	18.0
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Restricted Stock Awards	142.5
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Restricted Stock Awards Weighted Average Period Of Recognition	2.6
Weighted Average Remaining Contractual Life for Stock Options/SARs Vested or Expected to Vest	3.5	3.7
Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding	3.5	3.8
Stock Options And Sars [Member]
Weighted Average Fair Value And Valuation Assumptions Used To Value ESPP Stock Based Compensation [Abstract]
Weighted Average Fair Value of Grants	$ 37.97	$ 34.20
Expected Volatility (in hundredths)	41.11%	36.77%
Risk-Free Interest Rate (in hundredths)	0.49%	1.18%
Dividend Yield (in hundredths)	0.60%	0.60%
Expected Life	5.6	5.5
Stock option and SAR Rollforward [Abstract]
Outstanding at January 1	8,374,000	8,445,000
Granted	20,000	16,000
Exercised (1)	(656,000)	(857,000)
Forfeited	(36,000)	(49,000)
Outstanding at March 31	7,702,000	7,555,000
Share Based Compensation Arrangement By Share Based Payment Award ESPP [Abstract]
Outstanding at January 1 - Price per Share	$ 70.01	$ 64.49
Granted - Price Per Share	$ 107.99	$ 101.30
Exercised - Price Per Share	$ 63.99	$ 50.15
Forfeited - Price per Share	$ 87.99	$ 86.73
Outstanding at March 31 - Price per Share	$ 70.54	$ 66.05
Stock Options/SARs Exercisable at March 31 (in shares)	4,594,000	4,601,000
Stock Options/SARs Exercisable at March 31 (price per share)	$ 59.20	$ 52.12
Intrinsic value of stock options/SARs exercised during the period	32.4	51.1
Stock options/SARs vested or expected to vest (in shares)	7,456,000	7,323,000
Weighted average grant price for stock options/SARs vested or expected to vest (per share)	$ 69.98	$ 65.36
Intrinsic value of stock options/SARs vested or expected to vest	307.5	389.6
Espp [Member]
Weighted Average Fair Value And Valuation Assumptions Used To Value ESPP Stock Based Compensation [Abstract]
Weighted Average Fair Value of Grants	$ 28.24	$ 21.55
Expected Volatility (in hundredths)	46.42%	30.26%
Risk-Free Interest Rate (in hundredths)	0.06%	0.18%
Dividend Yield (in hundredths)	0.60%	0.60%
Expected Life	0.5	0.5
Restricted Stock And Restricted Stock Units [Member]
Stock option and SAR Rollforward [Abstract]
Outstanding at January 1	4,240,000	4,009,000
Granted	271,000	266,000
Exercised (1)	(466,000)	(182,000)
Forfeited	(36,000)	(48,000)
Outstanding at March 31	4,009,000	4,045,000
Share Based Compensation Arrangement By Share Based Payment Award ESPP [Abstract]
Outstanding at January 1 - Price per Share	$ 82.93	$ 79.13
Granted - Price Per Share	$ 112.53	$ 105.65
Exercised - Price Per Share	$ 70.13	$ 67.27
Forfeited - Price per Share	$ 88.18	$ 78.30
Outstanding at March 31 - Price per Share	$ 86.36	$ 81.42
Intrinsic value of restricted stock and restricted stock units released during the year	$ 53.1	$ 19.3
Aggregate Intrinsic Value Of Restricted Stock And Restricted Stock Units	445.4	479.4
Lease And Well [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	8.5	7.7
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	0.2
Exploration Costs [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	6.6	6.1
General And Administrative [Member]
Stock based compensation by job function [Line Items]
Compensation expense related to the company's stock-based compensation plans	$ 13.0	$ 13.4

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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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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Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding

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This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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No definition available.

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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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.

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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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The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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No definition available.

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The estimated measure of the percentage 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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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

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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 vested portions of options outstanding and currently exercisable under the stock option plan.

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

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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 plan.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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

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

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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

+ References

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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