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Schedule of Restructuring Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
2012-2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			$ 68
Charges	163	43	259	131
Cash spent	(44)		(110)
Non-cash settlements	(53)		(77)
Balance at end of period	140		140
2014-2018 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Charges	25		26
Cash spent			(2)
Balance at end of period	24		24
Severance And Related Costs
Restructuring Cost and Reserve [Line Items]
Charges	73
Severance And Related Costs | 2012-2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			68
Charges			182
Cash spent			(110)
Balance at end of period	140		140
Severance And Related Costs | 2014-2018 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Charges			26
Cash spent			(2)
Balance at end of period	24		24
Asset Write-Downs | 2012-2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Charges			77
Non-cash settlements			$ (77)

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

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Amount of consideration other than cash used to fully or partially settle an accrued restructuring cost.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

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