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Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities (Detail) (All Other Acquisitions [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013
All Other Acquisitions [Member]
Business Acquisition [Line Items]
Current assets, net of cash acquired	$ 446
Property, plant and equipment	198
Intangible assets	967
Goodwill	1,528
Other assets	37
Total assets acquired	3,176
Current liabilities	190
Deferred taxes	491
Other liabilities	120
Total liabilities	801
Cash consideration, net of cash acquired	$ 2,375

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