Stock Options and Other Share-Based Compensation (Details 1) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for stock options	$ 283	$ 265	$ 229
After tax compensation expense for stock options	184	172	149
Compensation expense for stock appreciation rights restricted stock performance units and restricted stock units	177	214	194
Compensation expense for stock appreciation rights, restricted stock, performance units and restricted stock units, After tax	115	139	126
Cash received in payment for option exercises	753	948	385
Tax benefits realized for the tax deductions from option exercises	101	121	66
Cash paid to settle performance units and stock appreciation rights	123	151	140
Maximum number of share that may be issued under LTIP from April 2004 through January 2014 (in shares)	160,000,000
Maximum number of shares that may be issued under the LTIP from April 2004 through January 2014 in a form other than a stock option, stock appreciation right or award requiring full payment for shares by the award recipient	64,000,000
Total intrinsic value options exercised	580	668	259
Total before-tax compensation cost related to nonvested share-based compensation arrangements	255
Weighted-average period of recognition of unrecognized compensation cost related to nonvested share-based compensation arrangements (In Years)	1 year 8 months 12 days
Number of LTIP performance units outstanding (in shares)	2,827,757	2,881,836
Number of LTIP performance units granted (in shares)	888,350
Number of LTIP performance units vested outstanding (in shares)	882,003
Number of LTIP performance units forfeited (in shares)	60,426
Fair value of the liability recorded for LTIP performance units outstanding	320
Equivalent shares granted under various LTIP and former Texaco and Unocal programs for outstanding stock appreciation rights and other awards	2,400,000
Liability recorded for Equivalent shares granted under various LTIP and former Texaco and Unocal programs for outstanding stock appreciation rights and other awards	$ 71
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term (in years)	3 years
Stock Options and Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term (in years)	10 years

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Equivalent shares granted for outstanding stock appreciation rights and other awards

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Number of LTIP performance units outstanding.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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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 noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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