Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
U.S. [Member]
Change in Benefit Obligation
Benefit obligation at January 1	$ 10,271	$ 9,664
Service cost	374	337	266
Interest cost	463	486	481
Actuarial loss (gain)	1,920	568
Benefits paid	(863)	(784)
Benefit obligation at December 31	12,165	10,271	9,664
Change in Plan Assets
Fair value of plan assets at January	8,579	7,304
Actual return on plan assets	(143)	867
Contributions to employee pension plans	1,147	1,192
Benefits paid	(863)	(784)
Fair value of plan assets at December 31	8,720	8,579	7,304
Funded Status at December 31	(3,445)	(1,692)
International [Member]
Change in Benefit Obligation
Benefit obligation at January 1	5,070	4,715
Service cost	174	153	128
Interest cost	325	307	292
Plan participants contributions	6	7
Plan amendments	27
Actuarial loss (gain)	318	200
Foreign currency exchange rate changes	(98)	(17)
Benefits paid	(303)	(295)
Benefit obligation at December 31	5,519	5,070	4,715
Change in Plan Assets
Fair value of plan assets at January	3,503	3,235
Actual return on plan assets	118	361
Foreign currency exchange rate changes	(66)	(63)
Contributions to employee pension plans	319	258
Plan participants contributions	6	7
Benefits paid	(303)	(295)
Fair value of plan assets at December 31	3,577	3,503	3,235
Funded Status at December 31	(1,942)	(1,567)
Other Benefits [Member]
Change in Benefit Obligation
Benefit obligation at January 1	3,605	3,065
Service cost	58	39	43
Interest cost	180	175	180
Plan participants contributions	148	147
Plan amendments		12
Curtailments	(10)
Actuarial loss (gain)	149	486
Foreign currency exchange rate changes	(19)	11
Benefits paid	(346)	(330)
Benefit obligation at December 31	3,765	3,605	3,065
Change in Plan Assets
Fair value of plan assets at January	0	0
Contributions to employee pension plans	198	183
Plan participants contributions	148	147
Benefits paid	(346)	(330)
Fair value of plan assets at December 31	0	0	0
Funded Status at December 31	$ (3,765)	$ (3,605)

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The amount of increase or decrease in the benefit obligation attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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