Pension Benefits Plan Assets (Details) - Global - Pension - USD ($) $ in Millions		12 Months Ended
		Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 4,677	$ 5,043	$ 4,544
Net Asset Value Excluded From Fair Value By Input	[1]	2,850	3,292
Expected contribution by Company		7
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		497	583
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1,330	1,168
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0	131
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		75	87
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Cash and Cash Equivalents | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		75	66
Cash and Cash Equivalents | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	21
Cash and Cash Equivalents | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Domestic Corporate Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		412	500
Net Asset Value Excluded From Fair Value By Input	[1]	$ 0	$ 0
Percentage of consolidated plan assets represented by investment in Company comon stock		1.00%	1.20%
Domestic Corporate Common Stock | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 412	$ 500
Domestic Corporate Common Stock | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Domestic Corporate Common Stock | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Foreign Corporate Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		11	18
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Foreign Corporate Common Stock | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		10	17
Foreign Corporate Common Stock | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1	1
Foreign Corporate Common Stock | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Mutual Fund International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		41	158
Net Asset Value Excluded From Fair Value By Input	[1]	34	38
Mutual Fund International Equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Mutual Fund International Equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		7	120
Mutual Fund International Equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Mutual Funds Domestic Debt
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		53	36
Net Asset Value Excluded From Fair Value By Input	[1]	0	36
Mutual Funds Domestic Debt | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Mutual Funds Domestic Debt | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		53	0
Mutual Funds Domestic Debt | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Collective Trusts Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		437	525
Net Asset Value Excluded From Fair Value By Input	[1]	437	525
Collective Trusts Domestic Equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Collective Trusts Domestic Equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Collective Trusts Domestic Equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Collective Trusts International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		1,422	1,566
Net Asset Value Excluded From Fair Value By Input	[1]	1,330	1,390
Collective Trusts International Equity | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Collective Trusts International Equity | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		92	176
Collective Trusts International Equity | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Collective Trusts Other International Debt
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		331	365
Net Asset Value Excluded From Fair Value By Input	[1]	331	365
Collective Trusts Other International Debt | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Collective Trusts Other International Debt | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Collective Trusts Other International Debt | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Limited Partnership
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		283	591
Net Asset Value Excluded From Fair Value By Input	[1]	283	591
Limited Partnership | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Limited Partnership | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Limited Partnership | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Bonds, corporate
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		498	482
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Bonds, corporate | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Bonds, corporate | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		498	482
Bonds, corporate | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Bonds, government
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		562	177
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Bonds, government | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Bonds, government | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		562	177
Bonds, government | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Bonds, other
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		62	63
Net Asset Value Excluded From Fair Value By Input	[1]	0	0
Bonds, other | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Bonds, other | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		62	63
Bonds, other | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		378	284
Net Asset Value Excluded From Fair Value By Input	[1]	378	284
Real estate | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Real estate | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Real estate | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		112	191
Net Asset Value Excluded From Fair Value By Input	[1]	57	63
Other [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		0	0
Other [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		55	128
Other [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 0	$ 0	$ 0
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target asset allocation		28.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target asset allocation		45.00%
Real Estate And Other
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target asset allocation		27.00%

[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.