Severance and Facility Closure Costs (Detail) $ in Millions	6 Months Ended
	Jul. 01, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 89
Charges Incurred	28
Cash Payments	(52)
Lease Accretion and Other Adjustments	1
Ending Balance	66
Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Charges Incurred	75
Termination benefits | Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	5
Cash Payments	(3)
Ending Balance	2
Termination benefits | Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	8
Charges Incurred	15
Cash Payments	(17)
Ending Balance	6
Lease and contract obligations, accruals for facilities closures and other costs | Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	40
Charges Incurred	4
Cash Payments	(18)
Ending Balance	26
Lease and contract obligations, accruals for facilities closures and other costs | Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	13
Charges Incurred	8
Cash Payments	(8)
Ending Balance	13
Lease and contract obligations, accruals for facilities closures and other costs | Other restructuring accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	5
Charges Incurred	1
Cash Payments	(2)
Lease Accretion and Other Adjustments	2
Ending Balance	6
Lease and contract obligations, accruals for facilities closures and other costs | Acquired entity store closure accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	18
Cash Payments	(4)
Lease Accretion and Other Adjustments	(1)
Ending Balance	$ 13