2.2.0.25truefalse42301 - Disclosure - Settlement and Other Risk Management (Narrative) (Details)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDfalsefalse12/31/2010
USD ($)
USD ($) / shares
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USD ($)
USD ($) / shares
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12/31/2010
USD ($)
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12/31/2010
GBP (£)
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12/31/2010
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12/31/2009
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12/31/2010
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{ma_RangeAxis} : Upper Limit [Member]
12/31/2010
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12/31/2009
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12/31/2010
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12/31/2009
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-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 45
-Paragraph 5
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