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Nonpension Postretirement and Postemployment Benefits Plan Assets (Details) - U.S. and Canada - Nonpension postretirement - USD ($) $ in Millions | Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 1,491 |  | $ 1,364 |  | $ 1,140
Net Asset Value Excluded From Fair Value By Input |  | 893 | [1] | 791 | [2] |
Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 264 |  | 261 |  |
Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 334 |  | 312 |  |
Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Cash and Cash Equivalents |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 6 |  | 9 |  |
Net Asset Value Excluded From Fair Value By Input |  | 0 | [1] | 0 | [2] |
Cash and Cash Equivalents | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 3 |  | 8 |  |
Cash and Cash Equivalents | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 3 |  | 1 |  |
Cash and Cash Equivalents | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Corporate stock, common |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 261 |  | 253 |  |
Net Asset Value Excluded From Fair Value By Input |  | 0 | [1] | 0 | [2] |
Corporate stock, common | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 261 |  | 253 |  |
Corporate stock, common | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Corporate stock, common | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Mutual Funds Domestic Equity |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 30 |  | 35 |  |
Net Asset Value Excluded From Fair Value By Input |  | 0 | [1] | 0 | [2] |
Mutual Funds Domestic Equity | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Mutual Funds Domestic Equity | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 30 |  | 35 |  |
Mutual Funds Domestic Equity | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Mutual Funds Domestic Debt |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 54 |  | 53 |  |
Net Asset Value Excluded From Fair Value By Input |  | 0 | [1] | 0 | [2] |
Mutual Funds Domestic Debt | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Mutual Funds Domestic Debt | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 54 |  | 53 |  |
Mutual Funds Domestic Debt | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Collective Trusts Domestic Equity |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 669 |  | 579 |  |
Net Asset Value Excluded From Fair Value By Input |  | 669 | [1] | 579 | [2] |
Collective Trusts Domestic Equity | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Collective Trusts Domestic Equity | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Collective Trusts Domestic Equity | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Limited Partnership |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 135 |  | 124 |  |
Net Asset Value Excluded From Fair Value By Input |  | 135 | [1] | 124 | [2] |
Limited Partnership | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Limited Partnership | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Limited Partnership | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Bonds, corporate |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 143 |  | 136 |  |
Net Asset Value Excluded From Fair Value By Input |  | 0 | [1] | 0 | [2] |
Bonds, corporate | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Bonds, corporate | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 143 |  | 136 |  |
Bonds, corporate | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Bonds, government |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 96 |  | 77 |  |
Net Asset Value Excluded From Fair Value By Input |  | 0 | [1] | 0 | [2] |
Bonds, government | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Bonds, government | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 96 |  | 77 |  |
Bonds, government | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Bonds, other |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 8 |  | 9 |  |
Net Asset Value Excluded From Fair Value By Input |  | 0 | [1] | 0 | [2] |
Bonds, other | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Bonds, other | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 8 |  | 9 |  |
Bonds, other | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Real Estate |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 89 |  | 88 |  |
Net Asset Value Excluded From Fair Value By Input |  | 89 | [1] | 88 | [2] |
Real Estate | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Real Estate | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |  | 0 |  |
Real Estate | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 0 |  | 0 |  |
Other [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  |  | 1 |  |
Net Asset Value Excluded From Fair Value By Input | [2] |  |  | 0 |  |
Other [Member] | Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  |  | 0 |  |
Other [Member] | Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  |  | 1 |  |
Other [Member] | Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  |  | $ 0 |  |
[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.
[2] | 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.

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