Goodwill and Intangible Assets - Change in Company's Goodwill and Intangible Assets (Detail) - USD ($) $ in Millions	6 Months Ended
	Sep. 09, 2017	Sep. 10, 2016
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 710
Goodwill, Additions	30
Goodwill, Impairment Loss	0
Goodwill, Other net adjustments	0
Goodwill, Ending Balance	740
Indefinite-lived Intangible Assets [Roll Forward]
Total intangible assets, Beginning balance	146
Total intangible assets, Additions	54
Total intangible assets, Impairments	0
Total intangible assets, Other net adjustments	0
Total intangible assets, Ending balance	200
Intangible Assets Accumulated Amortization [Roll Forward]
Accumulated amortization, Beginning balance	(107)
Accumulated amortization, Additions	(7)	$ (6)
Accumulated amortization, Other net adjustments	0
Accumulated amortization, Ending balance	(114)
Total intangible assets, net, Beginning balance	39
Total intangible assets, net, Ending balance	86
Trademarks and Tradenames - Indefinite Useful Lives
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite-lived Intangible Assets, Beginning Balance	5
Indefinite-lived Intangible Assets, Additions	0
Indefinite-lived Intangible Assets, Impairments	0
Indefinite-lived Intangible Assets, Other net adjustments	0
Indefinite-lived Intangible Assets, Ending Balance	5
Operating leases, Prescription files, Customer Lists And Other
Finite-lived Intangible Assets [Roll Forward]
Finite-lived Intangible Assets, Beginning Balance	141
Finite-lived Intangible Assets, Additions	54
Finite-lived Intangible Assets, Impairments	0
Finite-lived Intangible Assets, Other net adjustments	0
Finite-lived Intangible Assets, Ending Balance	$ 195