v2.4.0.6

Derivative and Financial Instruments - FX Notional (Details 5) In Millions, unless otherwise specified | Sep. 30, 2012 Sell U.S. dollar, buy other currencies [Member] USD ($) | Dec. 31, 2011 Sell U.S. dollar, buy other currencies [Member] USD ($) | Sep. 30, 2012 Sell euro, buy other currencies [Member] EUR (€) | Dec. 31, 2011 Sell euro, buy other currencies [Member] EUR (€) | Sep. 30, 2012 Buy U.S. dollar, sell other currencies [Member] USD ($) | Dec. 31, 2011 Buy U.S. dollar, sell other currencies [Member] USD ($) | Sep. 30, 2012 Buy British pound, sell other currencies [Member] GBP (£) | Dec. 31, 2011 Buy British pound, sell other currencies [Member] GBP (£) | Sep. 30, 2012 Buy Euro Sell British Pound [Member] EUR (€) | Dec. 31, 2011 Buy Euro Sell British Pound [Member] EUR (€)
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Trading Activity, Gains and Losses, Net [Line Items] |  |  |  |  |  |  |  |  |  |
Net notional position of foreign currency exchange derivatives | $ 285 | $ 1,949 | € 0 | € 61 | $ 477 | $ 0 | £ 3,709 | £ 0 | € 176 | € 0

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