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Income Taxes (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |
Federal |  | $ 2,594 | $ 2,803 | $ 3,065
State |  | 464 | 511 | 555
Total current income tax provision |  | 3,058 | 3,314 | 3,620
Deferred: |  |  |  |
Federal |  | (1,435) | 5 | (180)
State |  | 14 | (2) | (54)
Total deferred income tax provision |  | (1,421) | 3 | (234)
Total |  | $ 1,637 | $ 3,317 | $ 3,386
Reconciliation of the statutory income tax rate to the Company's effective income tax rate |  |  |  |
Statutory income tax rate | 21.00% | 35.00% | 35.00% | 35.00%
State income taxes, net of federal tax benefit |  | 4.10% | 4.10% | 4.00%
Provisional effect of the Tax Cuts and Jobs Act |  | (18.30%) |  |
Other |  | (1.00%) | (0.70%) | 0.30%
Effective income tax rate |  | 19.80% | 38.40% | 39.30%
Deferred tax assets: |  |  |  |
Lease and rents |  | $ 291 | $ 375 |
Inventory |  | 31 | 57 |
Employee benefits |  | 246 | 400 |
Allowance for doubtful accounts |  | 187 | 301 |
Retirement benefits |  | 40 | 65 |
Net operating loss and capital loss carryforwards |  | 101 | 125 |
Deferred income |  | 93 | 144 |
Other |  | 18 | 336 |
Valuation allowance |  | (77) | (135) |
Total deferred tax assets |  | 930 | 1,668 |
Deferred tax liabilities: |  |  |  |
Depreciation and amortization |  | (3,926) | (5,882) |
Total deferred tax liabilities |  | (3,926) | (5,882) |
Net deferred tax liabilities |  | (2,996) | (4,214) |
Reconciliation of the beginning and ending amount of unrecognized tax benefits |  |  |  |
Beginning balance | $ 344 | 307 | 338 | $ 188
Additions based on tax positions related to the current year |  | 62 | 68 | 57
Additions based on tax positions related to prior years |  | 32 | 70 | 122
Reductions for tax positions of prior years |  | (28) | (100) | (11)
Expiration of statutes of limitation |  | (10) | (22) | (13)
Settlements |  | (19) | (47) | (5)
Ending balance |  | 344 | 307 | 338
Interest recognized related to unrecognized tax benefits |  | 11 | 10 | $ 5
Accrued interest and penalties related to unrecognized tax benefits |  | 34 | $ 30 |
Unrecognized tax benefits that would impact effective tax rate |  | $ 317 |  |

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