Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$ 12,022us-gaap_ProfitLoss	$ 16,483us-gaap_ProfitLoss	$ 16,604us-gaap_ProfitLoss
Adjustments to reconcile net income to cash provided by operating activities
Depreciation	3,145us-gaap_Depreciation	3,327us-gaap_Depreciation	3,392us-gaap_Depreciation
Amortization of intangibles	1,347us-gaap_AmortizationOfIntangibleAssets	1,351us-gaap_AmortizationOfIntangibleAssets	1,284us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation	512us-gaap_ShareBasedCompensation	614us-gaap_ShareBasedCompensation	688us-gaap_ShareBasedCompensation
Deferred taxes	(237)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,610)us-gaap_DeferredIncomeTaxExpenseBenefit	797us-gaap_DeferredIncomeTaxExpenseBenefit
Net (gain)/loss on asset sales and other	(1,535)us-gaap_GainLossOnSaleOfOtherAssets	(236)us-gaap_GainLossOnSaleOfOtherAssets	(729)us-gaap_GainLossOnSaleOfOtherAssets
Loss on microelectronics business disposal	3,381
Changes in operating assets and liabilities, net of acquisitions/divestitures
Receivables (including financing receivables)	1,270us-gaap_IncreaseDecreaseInReceivables	(1,407)us-gaap_IncreaseDecreaseInReceivables	(2,230)us-gaap_IncreaseDecreaseInReceivables
Retirement related	(655)	294	(1,008)
Inventories	(39)us-gaap_IncreaseDecreaseInInventories	(57)us-gaap_IncreaseDecreaseInInventories	280us-gaap_IncreaseDecreaseInInventories
Other assets/other liabilities	(1,886)	(747)	733
Accounts payable	(456)	(529)	(224)
Net cash provided by operating activities	16,868	17,485	19,586
Cash flows from investing activities
Payments for property, plant and equipment	(3,740)	(3,623)	(4,082)
Proceeds from disposition of property, plant and equipment	404	372	410
Investment in software	(443)us-gaap_PaymentsToAcquireSoftware	(517)us-gaap_PaymentsToAcquireSoftware	(635)us-gaap_PaymentsToAcquireSoftware
Purchases of marketable securities and other investments	(2,338)us-gaap_PaymentsToAcquireInvestments	(4,608)us-gaap_PaymentsToAcquireInvestments	(4,109)us-gaap_PaymentsToAcquireInvestments
Proceeds from disposition of marketable securities and other investments	2,493	4,873	3,142
Non-operating finance receivables - net	(1,078)ibm_NonOperatingFinanceReceivablesNet	(1,063)ibm_NonOperatingFinanceReceivablesNet	(608)ibm_NonOperatingFinanceReceivablesNet
Acquisition of businesses, net of cash acquired	(656)	(3,056)	(3,722)
Divestitures of businesses, net of cash transferred	2,357	297	599
Net cash used in investing activities	(3,001)	(7,326)	(9,004)
Cash flows from financing activities
Proceeds from new debt	8,180	16,353	12,242
Payments to settle debt	(4,644)	(10,013)	(9,549)
Short-term borrowings/(repayments) less than 90 days - net	(1,753)	621	(441)
Common stock repurchases	(13,679)	(13,859)	(11,995)
Common stock transactions - other	709	1,074	1,540
Cash dividends paid	(4,265)us-gaap_PaymentsOfDividendsCommonStock	(4,058)us-gaap_PaymentsOfDividendsCommonStock	(3,773)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities	(15,452)	(9,883)	(11,976)
Effect of exchange rate changes on cash and cash equivalents	(655)	28	(116)
Net change in cash and cash equivalents	(2,240)	304	(1,511)
Cash and cash equivalents at January 1	10,716	10,412	11,922
Cash and cash equivalents at December 31	8,476	10,716	10,412
Supplemental data
Income taxes paid-net of refunds received	5,748us-gaap_IncomeTaxesPaidNet	4,024us-gaap_IncomeTaxesPaidNet	3,169us-gaap_IncomeTaxesPaidNet
Interest paid on debt	1,061us-gaap_InterestPaidNet	982us-gaap_InterestPaidNet	1,009us-gaap_InterestPaidNet
Capital lease obligations	$ 2us-gaap_CapitalLeaseObligationsIncurred	$ 14us-gaap_CapitalLeaseObligationsIncurred	$ 10us-gaap_CapitalLeaseObligationsIncurred

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The net cash flow from short-term commercial financing arrangements (terms generally 30 to 90 days) with dealers and remarketers of predominantly non-IBM products.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The increase during the period in capital lease obligations due to entering into new capital leases.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Amount of gain (loss) on sale or disposal of other assets.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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