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Borrowings (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Debt Disclosure
Total	$ 26,702
IBM International Group Capital LLC \| 3.72% Notes and Debentures, maturing in 2012-2013 and 1.02% Notes and Debentures, maturing in 2014-2015
Debt Disclosure
Total	$ 1,600
IBM International Group \| 3.72% Notes and Debentures, maturing in 2012-2013 and 1.02% Notes and Debentures, maturing in 2014-2015
Debt Disclosure
Percentage of ownership in indirect subsidiary (as a percent)	100.00%

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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