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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets: |  |
Lease and rents | $ 267 | $ 277
Inventory | 23 | 28
Employee benefits | 191 | 243
Bad debts and other allowances | 294 | 243
Retirement benefits | 47 | 130
Net operating loss and capital loss carryforwards | 480 | 529
Deferred income | 36 | 104
Insurance reserves | 430 | 467
Investments | 0 | 11
Other | 451 | 242
Valuation allowance | (374) | (520)
Total deferred income tax assets | 1,845 | 1,754
Deferred income tax liabilities: |  |
Investments | (289) | 0
Depreciation and amortization | (8,850) | (9,431)
Total deferred income tax liabilities | (9,139) | (9,431)
Net deferred income tax liabilities | $ (7,294) | $ (7,677)

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