Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Mar. 31, 2019	Mar. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating lease right-of-use assets impairment	$ 68
Impairment of long-lived assets		$ 6	$ 33	$ 15
Cumulative effect of adoption as an adjustment			$ (4,883)		$ (4,555)	$ (4,707)
Restatement Adjustment | ASU 2016-02
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cumulative effect of adoption as an adjustment						$ 152
Segment Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets	$ 11