Derivative Instruments - Impact on Statements of Income, Fair Value Hedges (Details 2a) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Fair value hedge gains (losses) recorded in income
Derivatives	$ (626)	$ 5,777	$ 3,379	$ 83
Hedged items	979	(5,465)	(2,623)	(180)
Total income statement impact	353	312	756	(97)
Hedge ineffectiveness	(54)	33	(112)	88
Excluded components	407	279	868	(185)
Interest rate contract
Fair value hedge gains (losses) recorded in income
Derivatives	(2,107)	(55)	(2,606)	(613)
Hedged items	2,434	249	3,309	890
Total income statement impact	327	194	703	277
Hedge ineffectiveness	(60)	7	(100)	35
Excluded components	387	187	803	242
Foreign exchange
Fair value hedge gains (losses) recorded in income
Derivatives	280	4,436	4,033	1,476
Hedged items	(368)	(4,521)	(4,120)	(1,571)
Total income statement impact	(88)	(85)	(87)	(95)
Hedge ineffectiveness	0	0	0	0
Excluded components	(88)	(85)	(87)	(95)
Commodity
Fair value hedge gains (losses) recorded in income
Derivatives	1,201	1,396	1,952	(780)
Hedged items	(1,087)	(1,193)	(1,812)	501
Total income statement impact	114	203	140	(279)
Hedge ineffectiveness	6	26	(12)	53
Excluded components	$ 108	$ 177	$ 152	$ (332)

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The amount recognized in earnings related to the change in fair value during the period of derivative or nonderivative instruments designated as fair value hedging instruments.

+ References

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- Definition

The amount recognized in earnings related to the change in fair value during the period of the hedged item in a fair value hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

Net gain (loss) recognized in earnings during the reporting period representing the amount of the fair value of the hedges' ineffectiveness.

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- Definition

Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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