Summary of Significant Accounting Policies - Adjustments from the Adoption of ASC 842 (Details) - USD ($) $ in Millions	Dec. 28, 2019	Mar. 31, 2019	Mar. 30, 2019
Assets
Prepaid expenses and other current assets	$ 263	$ 198	$ 221
Operating lease right-of-use assets	1,665	1,856
Intangible assets, net	2,225	2,273	2,293
Deferred tax assets	165	150	112
Liabilities
Current portion of operating lease liabilities	406	386
Accrued expenses and other current liabilities	353	302	374
Long-term portion of operating lease liabilities		1,828
Deferred rent			132
Deferred tax liabilities	440	431	438
Shareholders’ Equity
Retained earnings	$ 4,883	4,555	4,707
Retail Fleet Optimization Plan
Shareholders’ Equity
Sublease liabilities		54
Current deferred rent and tenant improvements		$ 18
Previously Reported
Assets
Prepaid expenses and other current assets			221
Intangible assets, net			2,293
Deferred tax assets			112
Liabilities
Accrued expenses and other current liabilities			374
Deferred rent			132
Deferred tax liabilities			438
Shareholders’ Equity
Retained earnings			4,707
Restatement Adjustment | ASU 2016-02
Assets
Prepaid expenses and other current assets			(23)
Operating lease right-of-use assets			1,856
Intangible assets, net			(20)
Deferred tax assets			38
Liabilities
Current portion of operating lease liabilities			386
Accrued expenses and other current liabilities			(72)
Long-term portion of operating lease liabilities			1,828
Deferred rent			(132)
Deferred tax liabilities			(7)
Shareholders’ Equity
Retained earnings			$ (152)