Other Deductions - Net - Additional Information about Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012		Sep. 30, 2012		Oct. 02, 2011
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	$ 617	[1]	$ 617	[1]
Impairment charges	494		494		585
In Process Research And Development [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	44	[1],[2]	44	[1],[2]
Impairment charges			314	[2]	440
Other Intangible Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	573	[1],[2]	573	[1],[2]
Impairment charges			180	[2]
Fair Value, Inputs, Level 1 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | In Process Research And Development [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	0	[1],[2]	0	[1],[2]
Fair Value, Inputs, Level 1 [Member] | Other Intangible Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	0	[1],[2]	0	[1],[2]
Fair Value, Inputs, Level 2 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	0	[1]	0	[1]
Fair Value, Inputs, Level 2 [Member] | In Process Research And Development [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	0	[1],[2]	0	[1],[2]
Fair Value, Inputs, Level 2 [Member] | Other Intangible Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	0	[1],[2]	0	[1],[2]
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	617	[1]	617	[1]
Fair Value, Inputs, Level 3 [Member] | In Process Research And Development [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	44	[1],[2]	44	[1],[2]
Fair Value, Inputs, Level 3 [Member] | Other Intangible Assets [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Intangible assets, fair value	$ 573	[1],[2]	$ 573	[1],[2]

[1] Fair value as of the date of impairment, as these assets are not measured at fair value on a recurring basis. See also Note 1C. Basis of Presentation and Significant Accounting Policies: Fair Value.

[2] Reflects intangible assets written down to their fair value of $617 million in the first nine months of 2012. The impairment charges of $494 million are included in Other deductions––net. When we are required to determine the fair value of intangible assets other than goodwill, we use an income approach, specifically the multi-period excess earnings method, also known as the discounted cash flow method. We start with a forecast of all the expected net cash flows associated with the asset, which includes the application of a terminal value for indefinite-lived assets, and then we apply an asset-specific discount rate to arrive at a net present value amount. Some of the more significant estimates and assumptions inherent in this approach include: the amount and timing of the projected net cash flows, which includes the expected impact of competitive, legal and/or regulatory forces on the projections and the impact of technological risk associated with IPR&D assets, as well as the selection of a long-term growth rate; the discount rate, which seeks to reflect the various risks inherent in the projected cash flows; and the tax rate, which seeks to incorporate the geographic diversity of the projected cash flows.