Supplemental Financial Statement Data - Consolidated Balance Sheet (Unaudited) (Details) - USD ($) $ in Millions	Jun. 27, 2020	Dec. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Trade receivables	$ 1,452	$ 1,315
Allowance for doubtful accounts	(23)	(10)
Redundable income taxes	13	56
Other receivables	250	215
Accounts receivable, net	1,692	1,576
Raw materials and supplies	327	303
Finished goods and materials in process	903	923
Inventories	1,230	1,226
Property	8,921	9,051
Accumulated depreciation	(5,485)	(5,439)
Property, net	3,436	3,612
Pension	269	241
Deferred income taxes	223	231
Nonpension postretirement benefits	312	283
Other	504	384
Other assets	1,308	1,139
Accrued income taxes	146	42
Accrued salaries and wages	253	290
Other	738	577
Other current liabilities	1,137	909
Income taxes payable	82	81
Nonpension postretirement benefits	31	33
Other	421	429
Other liabilities	$ 534	$ 543