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Fair value disclosure of financial assets and liabilities (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Estimated fair value measurement
Time deposits		$ 1,793
Long-term debt less accrued charges	(23,033)
Fair Value Disclosures of Financial Assets and Liabilities
Accrued charges	333	343
Carrying Amount
Estimated fair value measurement
Perpetual Notes	(80)
Time deposits		1,793
Long-term debt less accrued charges	(22,700)	(24,071)
Fair value
Estimated fair value measurement
Perpetual Notes	(80)
Time deposits		1,793
Long-term debt less accrued charges	(24,312)	(25,264)
Level 1
Estimated fair value measurement
Long-term debt less accrued charges	(18,181)	(19,730)
Level 2
Estimated fair value measurement
Perpetual Notes	(80)
Time deposits		1,793
Long-term debt less accrued charges	$ (6,131)	$ (5,534)

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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