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Financial Instruments (Fair value hedges) (Details) (Fair Value Hedges [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Fair value hedges
Hedge ineffectiveness gain (loss)	$ (29)	$ (105)
Hedge amount excluded from assessment of effectiveness	insignificant amounts	insignificant amounts
Interest Rate Contract [Member]
Fair value hedges
Gain (loss) on derivatives	(909)	(1,447)
Gain (loss) on hedged items	881	1,350
Foreign Exchange Contract [Member]
Fair value hedges
Gain (loss) on derivatives	(9)	(48)
Gain (loss) on hedged items	$ 8	$ 40

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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