Derivative Financial Instruments - Gain or Loss Recorded on Our Cash Flow Hedging Relationships (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	$ 47	$ 45	$ 159	$ 110
Gain (Loss) Reclassed From AOCI into Income (Effective Portion)	(3)	(6)	(211)	(21)
Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI, Interest Rate Swaps	20	24	94	61
Currency swaps [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion), Currency Swaps	27	21	65	49
Interest Expense [Member] \| Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassed from AOCI into Income (Effective Portion), Interest Rate Swaps	(1)	(1)	(2)	(5)
Interest Expense [Member] \| Currency swaps [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassed from AOCI into Income (Effective Portion), Currency swaps	(2)	(5)	(10)	(16)
Derivative related income (loss) [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassed From AOCI into Income (Effective Portion, Derivative loss recognized on termination of hedges))	0	0	(199)	0
Gain (Loss) Recognized In Income on Derivative (Ineffective Portion)	6	7	27	6
Derivative related income (loss) [Member] \| Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivative (Ineffective Portion), Interest Rate Swaps	0	1	2	1
Derivative related income (loss) [Member] \| Currency swaps [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivative (Ineffective Portion, Currency swaps)	$ 6	$ 6	$ 25	$ 5

unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss.

No definition available.

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- Definition

Unrealized gain loss on foreign currency derivatives net of tax.

+ References

No definition available.

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- Definition

unrealized gain loss on interest rate cash flow hedges net of tax accumulated other comprehensive income loss.

+ References

No definition available.

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- Definition

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)

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- Definition

The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

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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

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- Definition

The net gain (loss) during the reporting period due to ineffectiveness in foreign currency cash flow hedges. Recognized in earnings.

+ References

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- Definition

The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings.

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- Definition

The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

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