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Summary of Significant Accounting Policies - Changes in Carrying Amount of Service and Product Warranties (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Beginning Balance	$ 228us-gaap_StandardProductWarrantyAccrualCurrent	$ 194us-gaap_StandardProductWarrantyAccrualCurrent
Net provisions for warranties issued during the year	123us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	101us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Amounts incurred	(78)us-gaap_StandardProductWarrantyAccrualPayments	(73)us-gaap_StandardProductWarrantyAccrualPayments
Currency translation adjustments and other	(1)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease	6us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
Ending Balance	$ 272us-gaap_StandardProductWarrantyAccrualCurrent	$ 228us-gaap_StandardProductWarrantyAccrualCurrent

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- Definition

Increase or Decrease in standard product warranty liability due to currency translation. Does not include any Increase or Decrease in an extended product warranty liability due to currency translation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability that is expected to be paid within one year or the normal operating cycle, if longer. Does not include the balance for the extended product warranty liability.

+ References

No definition available.

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- Definition

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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