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Income Taxes (Income Taxes) (Details) - USD ($) $ / shares in Units, $ in Millions | 4 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 30, 2017 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Federal and International Audit Settlements |  |  | $ 717 |  |  |  |
Impact of Swiss Tax Reform |  | $ 72 | 24 |  |  |  |
Transition tax, payments made |  | 78 | 663 | $ 150 |  |  |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) | $ (2,500) | 0 | (8) | (28) |  |  |
Federal Statutory Tax Rate, Pre TCJ Act |  |  |  |  | 35.00% |  |
Income before income taxes in U.S |  | 4,070 | 4,123 | 3,864 |  |  |
Income before income taxes in Foreign |  | 4,999 | 5,189 | 5,325 |  |  |
Income before income taxes |  | 9,069 | 9,312 | 9,189 |  |  |
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |  |  |
Current: U.S. Federal |  | 715 | 652 | 437 |  |  |
Current: Foreign |  | 932 | 807 | 378 |  |  |
Current: State |  | 110 | 196 | 63 |  |  |
Provision for income taxes, Current total |  | 1,757 | 1,655 | 878 |  |  |
Deferred: U.S. Federal |  | 273 | 325 | 140 |  |  |
Deferred: Foreign |  | (167) | (31) | (4,379) |  |  |
Deferred: State |  | 31 | 10 | (9) |  |  |
Provision for income taxes, Deferred total |  | 137 | 304 | (4,248) |  |  |
Provision for income taxes |  | $ 1,894 | $ 1,959 | $ (3,370) |  |  |
U.S. Federal statutory tax rate |  |  |  |  |  |  |
U.S. Federal statutory tax rate |  | 21.00% | 21.00% | 21.00% |  |  |
State income tax, net of U.S. Federal tax benefit |  | 1.20% | 1.60% | 0.50% |  |  |
Lower taxes on foreign results |  | (0.80%) | (0.90%) | (2.20%) |  |  |
Provisional One Time Mandatory Repatriation TCJ Act, Percent |  | 0.00% | (0.10%) | 0.10% |  |  |
Remeasurement of Deferred Taxes TCJ Act, Percent |  | 0.00% | 0.00% | (0.40%) |  |  |
International Reorganization |  | 0.00% | 0.00% | (47.30%) |  |  |
Tax benefits |  | 0.00% | 0.00% | (7.80%) |  |  |
Other, net |  | (0.50%) | (0.60%) | (0.60%) |  |  |
Annual tax rate |  | 20.90% | 21.00% | (36.70%) |  |  |
Deferred tax liabilities |  |  |  |  |  |  |
Debt guarantee of wholly-owned subsidiary |  |  |  |  | $ 578 | $ 578 |
Property, plant and equipment |  |  |  |  | 1,851 | 1,583 |
Deferred tax liability, recapture of NOL |  |  |  |  | 504 | 335 |
Deferred Tax - Lease liability |  |  |  |  | 371 | 345 |
Other |  |  |  |  | 159 | 167 |
Gross deferred tax liabilities |  |  |  |  | 3,463 | 3,008 |
Deferred tax assets |  |  |  |  |  |  |
Net carryforwards |  |  |  |  | 5,008 | 4,168 |
Deferred Tax Assets, Goodwill and Intangible Assets |  |  |  |  | 1,146 | 793 |
Share-based compensation |  |  |  |  | 90 | 94 |
Retiree medical benefits |  |  |  |  | 153 | 154 |
Other employee-related benefits |  |  |  |  | 373 | 350 |
Pension benefits |  |  |  |  | 80 | 104 |
Deductible state tax and interest benefits |  |  |  |  | 150 | 126 |
Deferred Tax - Right of Use Asset |  |  |  |  | 371 | 345 |
Other |  |  |  |  | 866 | 741 |
Gross deferred tax assets |  |  |  |  | 8,237 | 6,875 |
Valuation allowances | (1,163) | $ (4,686) | $ (3,753) | $ (1,163) | (4,686) | (3,599) | $ (3,753)
Deferred tax assets, net |  |  |  |  | 3,551 | 3,276 |
Valuation Allowance [Abstract] |  |  |  |  |  |  |
Balance, beginning of year |  | (3,599) | (3,753) | (1,163) |  |  |
Provision |  |  |  |  | 1,082 | (124) | $ 2,639
Other additions/(deductions) |  | 5 | (30) | (49) |  |  |
Balance, end of year | $ (1,163) | $ (4,686) | $ (3,599) | $ (3,753) |  |  |
Net tax (benefit)/expense related to the TCJ Act per share | $ (1.70) |  | $ (0.01) | $ (0.02) |  |  |
Federal and International Audit Settlements, per share amount |  |  | $ 0.50 |  |  |  |
Deferred Tax Assets, Net |  |  |  |  | $ (88) | $ (268) |

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