Pension Benefits Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]
Expected contribution by Company		$ 13
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		5,043	$ 4,544	$ 4,584
Net Asset Value Excluded From Fair Value By Input	[1]	3,292	2,808
Expected contribution by Company		24
Pension | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		583	567
Pension | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1,168	1,038
Pension | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	131	141
Pension | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		87	66
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Pension | Cash and Cash Equivalents | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		66	54
Pension | Cash and Cash Equivalents | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		21	12
Pension | Cash and Cash Equivalents | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Domestic Corporate Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		500	482
Net Asset Value Excluded From Fair Value By Input	[1]	$ 0	$ 0
Percentage of consolidated plan assets represented by investment in Company comon stock		1.20%	1.50%
Pension | Domestic Corporate Common Stock | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 500	$ 482
Pension | Domestic Corporate Common Stock | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Domestic Corporate Common Stock | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Foreign Corporate Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		18	32
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Pension | Foreign Corporate Common Stock | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		17	31
Pension | Foreign Corporate Common Stock | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1	1
Pension | Foreign Corporate Common Stock | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Mutual Fund International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		158	148
Net Asset Value Excluded From Fair Value By Input	[1]	38	32
Pension | Mutual Fund International Equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Mutual Fund International Equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		120	116
Pension | Mutual Fund International Equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Mutual Funds Domestic Debt
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		36	66
Net Asset Value Excluded From Fair Value By Input	[1]	36	42
Pension | Mutual Funds Domestic Debt | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Mutual Funds Domestic Debt | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	24
Pension | Mutual Funds Domestic Debt | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Collective Trusts Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		525	653
Net Asset Value Excluded From Fair Value By Input	[1]	525	653
Pension | Collective Trusts Domestic Equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Collective Trusts Domestic Equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Collective Trusts Domestic Equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Collective Trusts International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1,566	1,250
Net Asset Value Excluded From Fair Value By Input	[1]	1,390	1,112
Pension | Collective Trusts International Equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Collective Trusts International Equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		176	138
Pension | Collective Trusts International Equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Collective Trusts Other International Debt
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		365	310
Net Asset Value Excluded From Fair Value By Input	[1]	365	310
Pension | Collective Trusts Other International Debt | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Collective Trusts Other International Debt | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Collective Trusts Other International Debt | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Limited Partnership
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		591	485
Net Asset Value Excluded From Fair Value By Input	[1]	591	485
Pension | Limited Partnership | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Limited Partnership | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Limited Partnership | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Bonds, corporate
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		482	452
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Pension | Bonds, corporate | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Bonds, corporate | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		482	452
Pension | Bonds, corporate | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Bonds, government
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		177	158
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Pension | Bonds, government | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Bonds, government | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		177	158
Pension | Bonds, government | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Bonds, other
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		63	41
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Pension | Bonds, other | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Bonds, other | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		63	41
Pension | Bonds, other | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Buy-in Annuity Contract
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	131
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Pension | Buy-in Annuity Contract | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Buy-in Annuity Contract | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Buy-in Annuity Contract | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	131	135
Pension | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		284	117
Net Asset Value Excluded From Fair Value By Input	[1]	284	117
Pension | Real estate | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Real estate | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Real estate | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		191	153
Net Asset Value Excluded From Fair Value By Input	[1]	63	57
Pension | Other [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Pension | Other [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		128	96
Pension | Other [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 0	$ 0	$ 6
Pension | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target asset allocation		20.00%
Pension | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target asset allocation		58.00%
Pension | Real Estate And Other
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target asset allocation		22.00%
US High Quality Bonds [Member] | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Bond Yield Percentile		40.00%
US High Quality Bonds [Member] | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Bond Yield Percentile		90.00%
Canada And Europe [Member] | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Bond Yield Percentile		10.00%
Canada And Europe [Member] | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Bond Yield Percentile		90.00%

[1] Certain assets that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.