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Acquisitions and Investments - Additional Information (Detail) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 20, 2013 USD ($) $ / shares	Dec. 31, 2015 USD ($) Acquisition	Dec. 31, 2014 USD ($) Acquisition	Dec. 31, 2013 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Aggregate purchase price of acquisitions		$ 86	$ 291	$ 2,397
Goodwill		$ 6,980	$ 8,539	$ 9,049
Weighted average life		5 years
Other Investments [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Aggregate purchase price of acquisitions	$ 19
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 635
Weighted average life	18 years
Patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 170
Weighted average life	20 years
Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 86
Weighted average life	20 years
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 3
Weighted average life	1 year
All Other Acquisitions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisitions completed | Acquisition		7	10
Aggregate purchase price of acquisitions	$ 2,378	$ 86	$ 291
Intangible assets	$ 894	12	59
Goodwill		$ 56	$ 167
Share holder received in cash per share | $ / shares	$ 60.00
Weighted average life	19 years

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Business Acquisition Cash Per Share Paid To Shareholders

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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=26713463&loc=d3e16265-109275

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Investing Activities
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