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Acquisitions and Investments - Summary of Acquisitions (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Combinations [Abstract]
Fair value of assets acquired, net of cash acquired	$ 3,329	$ 3,672	$ 1,517
Cash paid, net of cash acquired	(2,397)	(2,880)	(1,038)
Liabilities assumed, debt issued and minority interest	932	792	479
Excess purchase price over fair value of net assets acquired	$ 1,903	$ 1,000	$ 377

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- Definition

Amount of assets acquired at the acquisition date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

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- Definition

Amount of liabilities assumed at the acquisition date.

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-Name Accounting Standards Codification

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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