Changes in Balance of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015		Jun. 29, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassified from AOCL				$ 425		$ 337
Recognition of net actuarial losses	[1]			554		306
Amortization of prior service costs (credits)	[1]			(129)		28
Postretirement Benefit Plan Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassified from AOCL		$ 213	$ 167	425		334
Recognition of net actuarial losses		277	153	554	[1]	306	[1]
Amortization of prior service costs (credits)		$ (64)	$ 14	$ (129)	[1]	$ 28	[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 $213 million and $167 million for the quarters ended June 28, 2015 and June 29, 2014, which are comprised of the recognition of net actuarial losses of $277 million and $153 million for the quarters ended June 28, 2015 and June 29, 2014 and the amortization of net prior service (credits) costs of $(64) million and $14 million for the quarters ended June 28, 2015 and June 29, 2014.