Changes in Balance of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015		Sep. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassified from AOCL				$ 637		$ 520
Recognition of net actuarial losses	[1]			831		556
Amortization of net prior service cost (credits)	[1]			(194)		(36)
Postretirement Benefit Plan Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassified from AOCL		$ 212	$ 186	637		520
Recognition of net actuarial losses		277	250	831	[1]	556	[1]
Amortization of net prior service cost (credits)		$ (65)	$ (64)	$ (194)	[1]	$ (36)	[1]

[1] Reclassifications from AOCL related to our postretirement benefit plans were recorded as a component of net periodic benefit cost for each period presented (Note 6). These amounts include $212 million and $186 million for the quarters ended September 27, 2015 and September 28, 2014, which are comprised of the recognition of net actuarial losses of $277 million and $250 million for the quarters ended September 27, 2015 and September 28, 2014 and the amortization of net prior service (credits) costs of $(65) million and $(64) million for the quarters ended September 27, 2015 and September 28, 2014.