Components of Net Income Tax Provisions Related to Special Items and Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Income Taxes [Line Items]
Income Tax Provision Benefit Related To Special Items	$ (126)	$ (79)
Other restructuring and other charges
Income Taxes [Line Items]
Income Tax Provision Benefit Related To Special Items	(37)	(82)
Acquisition-related costs
Income Taxes [Line Items]
Income Tax Provision Benefit Related To Special Items	0	3
Settlement with taxing authority
Income Taxes [Line Items]
Income Tax Provision Benefit Related To Special Items	(91)	0
Other expense
Income Taxes [Line Items]
Income Tax Provision Benefit Related To Special Items	$ 2	$ 0