Discontinued Operations and Transition Costs - Summary of Components of Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 26, 2021	Jun. 27, 2020	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Discontinued Operations and Disposal Groups [Abstract]
Net revenue	$ 346	$ 333		$ 677	$ 664	$ 1,348	$ 1,332	$ 1,248
Operating income (loss)	54	49		73	58	(46)	8	(72)
Income (loss) from discontinued operations before income taxes	51	49		69	58	(46)	8	(71)
Income tax expense	11	9		18	17	25	49	33
Income (loss) from discontinued operations, net of taxes	$ 40	$ 40	$ 40	$ 51	$ 41	$ (71)	$ (41)	$ (104)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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+ Details

- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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+ Details