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Acquisitions - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
	Aug. 08, 2012	Sep. 30, 2012 Acquisition
Business Acquisition [Line Items]
Acquisitions completed		12
Aggregate purchase price for Acquisitions		$ 2,305,000,000
Intangible assets		597,000,000
Weighted-average life		21 years 1 month 6 days
Cost of acquisition of entity	2,500,000,000
Cash received by shareholders per share	$ 60.00
Shares outstanding	42,400,000
Customer relationship [Member]
Business Acquisition [Line Items]
Intangible assets		238,000,000
Weighted-average life		24 years 8 months 12 days
Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets		91,000,000
Weighted-average life		18 years 6 months
Other intangible assets [Member]
Business Acquisition [Line Items]
Intangible assets		268,000,000
Weighted-average life		18 years 8 months 12 days
Goodwill [Member]
Business Acquisition [Line Items]
Intangible assets		$ 774,000,000

X

- Definition

Amount Received In Cash Per Share

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- Definition

Business Acquisition, Cost of Acquired Entity

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- Definition

Business Acquisition Purchase Price Allocation Intangible Assets

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- Definition

Business Acquisition Upfront Payment For Acquired All Outstanding Equity Shares

+ References

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

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- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The number of businesses acquired by the entity during the period.

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