v2.4.0.6
Derivative and Financial Instruments - FX Notional (Details 5)
In Millions, unless otherwise specified
Dec. 31, 2012
Sell U.S. dollar, buy other currencies [Member]
USD ($)
Mar. 31, 2013
Buy U.S. dollar, sell other currencies [Member]
USD ($)
Dec. 31, 2012
Buy U.S. dollar, sell other currencies [Member]
USD ($)
Mar. 31, 2013
Buy British pound, sell other currencies [Member]
GBP (£)
Dec. 31, 2012
Buy Euro Sell British Pound [Member]
EUR (€)
Trading Activity, Gains and Losses, Net [Line Items]          
Net notional position of foreign currency exchange derivatives $ 2,573 [1] $ 842 [2] $ 140 [2] £ 11 € 96
[1]   *Primarily euro, Canadian dollar, Norwegian krone and British pound.
[2] **Primarily euro, Canadian dollar and Norwegian krone.