Derivative Instruments (Income Statement Impact of Derivatives Used in a Dealer or Broker Capacity) (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	$ 1	$ 1	$ 37	$ 65
Global Commodities Business [Member] \| Derivative [Member]
Derivative [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		116	166	74
Global Commodities Business [Member]
Derivative [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	$ (2)	$ (10)	$ 16	$ 19

- Definition

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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