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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) | The income tax provision for continuing operations consisted of the following for the years ended December 31:
In millions | 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |
Federal | $ | 1,480 |  |  | $ | 2,594 |  |  | $ | 2,803 |
State | 499 |  |  | 464 |  |  | 511 |
| 1,979 |  |  | 3,058 |  |  | 3,314 |
Deferred: |  |  |  |  |
Federal | 22 |  |  | (1,435 | ) |  | 5 |
State | 1 |  |  | 14 |  |  | (2 | )
| 23 |  |  | (1,421 | ) |  | 3 |
Total | $ | 2,002 |  |  | $ | 1,637 |  |  | $ | 3,317 |
Schedule of Effective Income Tax Rate Reconciliation | The following table is a reconciliation of the statutory income tax rate to the Company’s effective income tax rate for continuing operations for the years ended December 31:
| 2018 |  | 2017 |  | 2016
Statutory income tax rate | 21.0 | % |  | 35.0 | % |  | 35.0 | %
State income taxes, net of federal tax benefit | 27.7 |  |  | 4.1 |  |  | 4.1 |
Effect of the Tax Cuts and Jobs Act | (7.1 | ) |  | (18.3 | ) |  | — |
Health insurer fee | 2.2 |  |  | — |  |  | 0.2 |
Goodwill impairments | 89.5 |  |  | 0.8 |  |  | — |
Sale of subsidiary | 5.0 |  |  | — |  |  | — |
Other | 4.1 |  |  | (1.8 | ) |  | (0.9 | )
Effective income tax rate | 142.4 | % |  | 19.8 | % |  | 38.4 | %
Schedule of Deferred Tax Assets and Liabilities | The following table is a summary of the components of the Company’s deferred income tax assets and liabilities as of December 31:
In millions | 2018 |  | 2017
Deferred income tax assets: |  |  |
Lease and rents | $ | 277 |  |  | $ | 291 |
Inventory | 28 |  |  | 31 |
Employee benefits | 243 |  |  | 246 |
Allowance for doubtful accounts | 243 |  |  | 187 |
Retirement benefits | 130 |  |  | 40 |
Net operating loss and capital loss carryforwards | 529 |  |  | 101 |
Deferred income | 104 |  |  | 93 |
Insurance reserves | 467 |  |  | — |
Investments | 11 |  |  | — |
Other | 242 |  |  | 18 |
Valuation allowance | (520 | ) |  | (77 | )
Total deferred income tax assets | 1,754 |  |  | 930 |
Deferred income tax liabilities: |  |  |
Depreciation and amortization | (9,431 | ) |  | (3,926 | )
Total deferred income tax liabilities | (9,431 | ) |  | (3,926 | )
Net deferred income tax liabilities | $ | (7,677 | ) |  | $ | (2,996 | )
Schedule of Unrecognized Tax Benefits Roll Forward | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
In millions | 2018 |  | 2017 |  | 2016
Beginning balance | $ | 344 |  |  | $ | 307 |  |  | $ | 338 |
Additions based on tax positions related to the current year | 1 |  |  | 62 |  |  | 68 |
Additions based on tax positions related to prior years | 324 |  |  | 32 |  |  | 70 |
Reductions for tax positions of prior years | (5 | ) |  | (28 | ) |  | (100 | )
Expiration of statutes of limitation | (2 | ) |  | (10 | ) |  | (22 | )
Settlements | (1 | ) |  | (19 | ) |  | (47 | )
Ending balance | $ | 661 |  |  | $ | 344 |  |  | $ | 307 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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