Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($)
Goodwill [Line Items]
Balance beginning	$ 7,783
Acquisitions, divestitures and other adjustments	34
Effect of foreign currency translation	70
Balance ending	7,887
Buy
Goodwill [Line Items]
Balance beginning	2,789
Acquisitions, divestitures and other adjustments	2
Effect of foreign currency translation	63
Balance ending	2,854
Watch
Goodwill [Line Items]
Balance beginning	4,994
Acquisitions, divestitures and other adjustments	32
Effect of foreign currency translation	7
Balance ending	$ 5,033

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.

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
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of increase (decrease) 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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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

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