Derivative Instruments - Impact on Statements of Income, Cash Flow Hedges (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gains/(losses) recorded in income and other comprehensive income/(loss)
Recognition of gain (loss) related to cash flow hedges in Income	$ (33)
Maximum length of time hedged in forecasted transactions	9 years
Cash Flow Hedging
Gains/(losses) recorded in income and other comprehensive income/(loss)
Derivatives - effective portion reclassified from AOCI to income	24	(101)	28
Hedge ineffectiveness recorded directly in income	0	0	5
Total income statement impact	24	(101)	33
Effective portion recorded in OCI	98	(525)	141
Total change in OCI for period	74	(424)	113
Cash Flow Hedging \| Interest rate contracts
Gains/(losses) recorded in income and other comprehensive income/(loss)
Derivatives - effective portion reclassified from AOCI to income	(54)	(108)	(3)
Hedge ineffectiveness recorded directly in income	0	0	5
Total income statement impact	(54)	(108)	2
Effective portion recorded in OCI	189	(565)	13
Total change in OCI for period	243	(457)	16
Cash Flow Hedging \| Foreign exchange contracts
Gains/(losses) recorded in income and other comprehensive income/(loss)
Derivatives - effective portion reclassified from AOCI to income	78	7	31
Hedge ineffectiveness recorded directly in income	0	0	0
Total income statement impact	78	7	31
Effective portion recorded in OCI	(91)	40	128
Total change in OCI for period	$ (169)	$ 33	$ 97

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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-Paragraph 1

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

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