Income Taxes - Reconciliation of Liabilities Associated with Uncertain Tax Provisions (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 1,452us-gaap_UnrecognizedTaxBenefits	$ 1,453us-gaap_UnrecognizedTaxBenefits	$ 1,353us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year	154	146	156
Additions for tax positions of prior years	96	109	98
Additions related to acquisitions	43
Impact of changes in exchange rates	(62)	(47)	12
Settlements with tax authorities	(27)	(64)	(17)
Reductions for tax positions of prior years	(212)	(109)	(103)
Reductions due to the lapse of the applicable statute of limitations	(42)	(36)	(46)
Balance at end of year	$ 1,402us-gaap_UnrecognizedTaxBenefits	$ 1,452us-gaap_UnrecognizedTaxBenefits	$ 1,453us-gaap_UnrecognizedTaxBenefits

Unrecognized tax benefits increases (decreases) resulting from changes in exchange rates.

No definition available.

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

+ References

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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