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Business Combinations and Other Investment Activities - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Business_Acquisitions Transaction	Dec. 31, 2014 USD ($) Transaction	Dec. 31, 2013 USD ($) Transaction
Business Acquisition
Business Acquisitions And Other Investing Activities Net	17	69	2
Equity investment arising from an impairment of carrying value	$ 3	$ 9	$ 25
Series of Individually Immaterial Business Acquisitions
Business Acquisition
Number of equity investments | Transaction	2	6
Number of Business Acquisitions and Other Equity Investments	85
Business Acquisitions And Other Investing Activities Net	17	69	36
Number of businesses acquired	2		2
Other Nonoperating Income (Expense)
Business Acquisition
Gain (loss) on sale of equity investment	$ 57
Marketing Applications | Series of Individually Immaterial Business Acquisitions
Business Acquisition
Number of businesses acquired | Transaction		2

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=49116238&loc=d3e32787-111569

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