Income Taxes (Details 1) (USD $) In Millions	3 Months Ended
Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2010
Reconciliation of amounts due to uncertainty in income taxes
Beginning of the period	$ 2,555	$ 392	$ 396
Increase resulting from tax positions taken	9	2,121	4
Decrease resulting from tax positions taken	(2)	(2)
Cumulative translation adjustments	61	44	9
End of the period	$ 2,623	$ 2,555	$ 409

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The gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the beginning balance sheet date, excluding amounts pertaining to examined tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph a

+ Details

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- Definition

The gross amount of decreases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph a(2)

+ Details

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- Definition

The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph a(2)

+ Details

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- Definition

Unrecognized Tax Benefits Cumulative translation adjustments.

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