2.2.0.25truefalse06061 - Disclosure - Available-for-sale investments (Details 1)truefalseIn Millionsfalse1falsefalseUSDfalsefalse3/31/2011
USD ($)
USD ($) / shares
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USD ($)
USD ($) / shares
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 20
-Subparagraph a
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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3/31/2011
USD ($)
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12/31/2010
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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3/31/2011
USD ($)
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12/31/2010
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
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