Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Cash flows from operating activities:
Net (loss) income	$ (216)	$ 293
Income from discontinued operations	0	(1)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	316	260
Gain on disposal of property and equipment—net	(15)	(1)
Asset impairment charges	9	0
Amortization of deferred financing costs	12	3
Deferred tax (benefit) provision	(65)	7
Share-based compensation expense	29	22
Provision for doubtful accounts	80	14
Changes in operating assets and liabilities:
Decrease (increase) in receivables	182	(162)
Decrease (increase) in inventories—net	161	(22)
Decrease in prepaid expenses and other assets	30	14
Increase in accounts payable and cash overdraft liability	19	160
Decrease in accrued expenses and other liabilities	(9)	(29)
Net cash provided by operating activities of continuing operations	533	558
Net cash provided by operating activities of discontinued operations	0	1
Net cash provided by operating activities	533	559
Cash flows from investing activities:
Acquisition of businesses—net of cash	(973)	(1,829)
Proceeds from sales of assets	7	0
Proceeds from sales of property and equipment	33	9
Purchases of property and equipment	(154)	(157)
Net cash used in investing activities	(1,087)	(1,977)
Cash flows from financing activities:
Proceeds from debt borrowings	3,645	5,084
Principal payments on debt and financing leases	(2,640)	(3,654)
Net proceeds from issuance of Series A Convertible Preferred Stock	491	0
Debt financing costs and fees	(33)	(42)
Proceeds from employee stock purchase plan	15	15
Proceeds from exercise of stock options	2	13
Tax withholding payments for net share-settled equity awards	(5)	(5)
Net cash provided by financing activities	1,475	1,411
Net increase (decrease) in cash, cash equivalents and restricted cash	921	(7)
Cash, cash equivalents and restricted cash—beginning of period	98	105
Cash, cash equivalents and restricted cash—end of period	1,019	98
Supplemental disclosures of cash flow information:
Interest paid—net of amounts capitalized	122	112
Income taxes paid—net	3	116
Property and equipment purchases included in accounts payable	11	21
Leased assets obtained in exchange for financing lease liabilities	63	77
Leased assets obtained in exchange for operating lease liabilities	21	11
Cashless exercise of stock options	0	1
Paid-in-kind Series A Convertible Preferred Stock Dividends	$ 5	$ 0