Derivative Instruments - Impact on Statements of Income, Cash Flow Hedges (Details 2b) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Cash flow hedge gains and losses [Abstract]
Total change in OCI for period			$ (7)	$ 195
Loss on discontinuation of cash flow hedge due to forecasted wholesale deposits probable of not occurring				25
Recognition of losses related to cash flow hedges in Income			82
Maximum length of time hedged in forecasted transactions	10		10 years
Cash Flow Hedging [Member]
Cash flow hedge gains and losses [Abstract]
Derivatives - effective portion reclassified from AOCI to income	50	73	235	80
Hedge ineffectiveness recorded directly in income	5	5	14	13
Total income statement impact	55	78	249	93
Effective portion recorded in OCI	145	38	(11)	322
Total change in OCI for period	95	(35)	(246)	242
Foreign exchange \| Cash Flow Hedging [Member]
Cash flow hedge gains and losses [Abstract]
Derivatives - effective portion reclassified from AOCI to income	(17)	(16)	(2)	(91)
Hedge ineffectiveness recorded directly in income	0	0	0	(3)
Total income statement impact	(17)	(16)	(2)	(94)
Effective portion recorded in OCI	(18)	(21)	(40)	(86)
Total change in OCI for period	(1)	(5)	(38)	5
Interest rate contract \| Cash Flow Hedging [Member]
Cash flow hedge gains and losses [Abstract]
Derivatives - effective portion reclassified from AOCI to income	67	89	237	171
Hedge ineffectiveness recorded directly in income	5	5	14	16
Total income statement impact	72	94	251	187
Effective portion recorded in OCI	163	59	29	408
Total change in OCI for period	$ 96	$ (30)	$ (208)	$ 237

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.

Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 31, 46

-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 Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 14, 17, 20, 24, 26

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 46

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 55

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 24

-Subparagraph b

-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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 14, 17, 20, 26

-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 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph c(3)

-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.

+ Details