Effects of Cash Flow Hedges (Detail) (Cash Flow Hedges, USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings	$ (53)	$ (312)	$ (118)
Gains / (losses) recognized in OCI	102	(75)	(444)
Gains / (losses) on ineffectiveness recognized in earnings	1	(26)	(6)
Gains/ (losses) on amount excluded from effectiveness testing recognized in earnings		(556)	(173)
Intercompany Loans
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) recognized in OCI			1
Foreign exchange contracts \| Intercompany Loans
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings			2
Foreign exchange contracts \| Forecasted transactions
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings	(26)	58	(38)
Gains / (losses) recognized in OCI	(23)	(16)	12
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings	(23)	(10)	19
Gains / (losses) recognized in OCI	3	(24)	(22)
Gains / (losses) on ineffectiveness recognized in earnings	1	(3)	(4)
Gains/ (losses) on amount excluded from effectiveness testing recognized in earnings			(17)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings	(4)	(360)	(101)
Gains / (losses) recognized in OCI	122	(35)	(435)
Gains / (losses) on ineffectiveness recognized in earnings		(23)	(2)
Gains/ (losses) on amount excluded from effectiveness testing recognized in earnings		$ (556)	$ (156)

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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

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4D

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959

+ Details

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- Definition

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

+ Details

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- Definition

The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings.

+ References

+ Details

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- Definition

The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

+ Details

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