Changes in Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 28, 2014	Jun. 29, 2014	Sep. 29, 2013	Sep. 28, 2014		Sep. 29, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				$ (9,601)		$ (13,493)
Other comprehensive (loss) income before reclassifications
Net actuarial losses				(3,778)	[1]
Prior service credits				3,043	[1]
Other				(48)		(1)
Other comprehensive (loss) income before reclassifications				(783)		(1)
Amounts reclassified from AOCL
Recognition of net actuarial losses	250		243	556		730
Amortization of net prior service (credits) costs	(64)		11	(36)		31
Total reclassified from AOCL				520	[2]	759	[2]
Other						(2)
Other comprehensive income (loss), net of tax	120		306	(263)		758
Ending balance	(9,864)		(12,735)	(9,864)		(12,735)
Postretirement Benefit Plan Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(9,649)		(13,532)
Other comprehensive (loss) income before reclassifications
Net actuarial losses				(3,778)	[1]
Prior service credits				3,043	[1]
Other comprehensive (loss) income before reclassifications		(735)		(735)
Amounts reclassified from AOCL
Recognition of net actuarial losses				556		730
Amortization of net prior service (credits) costs				(36)		31
Total reclassified from AOCL	186		254	520	[2]	761	[2]
Other comprehensive income (loss), net of tax				(215)		761
Ending balance	(9,864)		(12,771)	(9,864)		(12,771)
Other, net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				48		39
Other comprehensive (loss) income before reclassifications
Other				(48)		(1)
Other comprehensive (loss) income before reclassifications				(48)		(1)
Amounts reclassified from AOCL
Total reclassified from AOCL						(2)	[2]
Other						(2)
Other comprehensive income (loss), net of tax				(48)		(3)
Ending balance			$ 36			$ 36

[1] Changes in AOCL before reclassifications related to our postretirement benefit plans include net actuarial losses from the re-measurements of substantially all our defined benefit pension plans in June 2014 and prior service credits from plan amendments to freeze future retirement benefits in certain of our qualified and nonqualified defined benefit pension plans for non-union employees (Note 5).

[2] Reclassifications from AOCL related to our postretirement benefit plans were recorded as a component of net periodic benefit cost for each period presented (Note 5). These amounts include $186 million and $254 million for the quarters ended September 28, 2014 and September 29, 2013, which are comprised of the recognition of net actuarial losses of $250 million and $243 million for the quarters ended September 28, 2014 and September 29, 2013 and the amortization of net prior service (credits) costs of $(64) million and $11 million for the quarters ended September 28, 2014 and September 29, 2013.