Pension and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 27, 2013
Pension Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Contribution to pension plans	$ 93
Pension Plans [Member] | Minimum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Expected contributions to plans	13
Pension Plans [Member] | Maximum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Expected contributions to plans	52
Other Postretirement Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Contribution to other postretirement benefit plans	5
Expected contributions to plans	$ 6