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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 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 | 0
Investments | 11 | 0
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)

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