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Financial Instruments (Free-standing derivatives) (Details) (Free Standing Derivatives [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Free standing derivatives
Gain (loss) on derivatives	$ (902)	$ (76)
Interest Rate Contract [Member]
Free standing derivatives
Gain (loss) on derivatives	(61)	(61)
Foreign Exchange Contract [Member]
Free standing derivatives
Gain (loss) on derivatives	(853)	(21)
Other Contract [Member]
Free standing derivatives
Gain (loss) on derivatives	$ 12	$ 6

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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