Retirement-Related Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Retirement-related plans cost
Defined benefit and contribution pension plan - cost	$ 370	$ 234	$ 802	$ 555
Nonpension postretirement plans - cost	88	86	173	173
Total	458	319	975	728
Year-to-year percent change, defined benefit and contribution pension plans cost (as a percent)	58.40%		44.50%
Year-to-year percent change, Nonpension postretirement plans cost (as a percent)	2.00%		0.30%
Year-to-year percent change, total (as a percent)	43.20%		34.00%
Proceeds from Medicare Prescription Drug Improvement and Modernization Act of 2003	8.7		18.0
Defined Benefit Pension Plans \| U.S. Plan(s)
Retirement-related plans cost
Interest cost	609	648	1,228	1,301
Expected return on plan assets	(1,007)	(1,001)	(2,022)	(2,009)
Amortization of prior service costs/(credits)	3	3	5	5
Recognized actuarial losses	198	116	409	235
Total net periodic pension (income)/cost of defined benefit plans	(197)	(234)	(379)	(468)
Cost of defined contribution plans	216	212	481	478
Defined benefit and contribution pension plan - cost	19	(22)	101	10
Defined Benefit Pension Plans \| Non-U.S. Plans
Retirement-related plans cost
Service cost	126	123	256	251
Interest cost	471	444	925	913
Expected return on plan assets	(643)	(592)	(1,263)	(1,218)
Amortization of prior service costs/(credits)	(40)	(42)	(80)	(84)
Recognized actuarial losses	242	171	487	349
Curtailments and settlements	1	0	1	27
Multi-employer plan/other costs	40	20	74	52
Total net periodic pension (income)/cost of defined benefit plans	195	125	399	290
Cost of defined contribution plans	156	131	302	255
Defined benefit and contribution pension plan - cost	351	255	700	545
Expected current year contributions to non-U.S. defined benefit plans	800		800
Year-to-date contributions to non-U.S. defined benefit plans			448
Nonpension Postretirement Plans \| U.S. Plan(s)
Retirement-related plans cost
Service cost	9	8	17	17
Interest cost	59	65	118	131
Amortization of prior service costs/(credits)		(4)		(7)
Nonpension postretirement plans - cost	68	70	134	141
Nonpension Postretirement Plans \| Non-U.S. Plans
Retirement-related plans cost
Service cost	3	2	5	4
Interest cost	17	15	34	29
Expected return on plan assets	(3)	(2)	(5)	(5)
Amortization of prior service costs/(credits)	(1)	(1)	(2)	(3)
Recognized actuarial losses	4	3	7	6
Nonpension postretirement plans - cost	$ 20	$ 16	$ 39	$ 32

The estimated amount of the employer's expected contributions to its non-U.S. defined benefit retirement plans in the fiscal year.

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The amount of subsidy in connection with the Medicare Prescription Drug Improvement and Modernization Act of 2003.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The increase in the fair value of plan assets from contributions made by the employer.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The aggregate amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from 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. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits.

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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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The amount of the cost recognized during the period for defined contribution plans.

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The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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