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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Lease and rents | $ 5,742.0 | $ 5,731.0
Inventory | 80.0 | 23.0
Employee benefits | 238.0 | 191.0
Bad debts and other allowances | 395.0 | 294.0
Retirement benefits | 0.0 | 47.0
Net operating loss and capital loss carryforwards | 568.0 | 480.0
Deferred income | 43.0 | 36.0
Insurance reserves | 489.0 | 430.0
Payroll tax deferral | 173.0 | 0.0
Other | 500.0 | 451.0
Valuation allowance | (454.0) | (374.0)
Total deferred income tax assets | 7,774.0 | 7,309.0
Deferred income tax liabilities: |  |
Retirement benefits | (29.0) | 0.0
Investments | (421.0) | (289.0)
Lease and rents | (5,368.0) | (5,464.0)
Depreciation and amortization | (8,750.0) | (8,850.0)
Total deferred income tax liabilities | (14,568.0) | (14,603.0)
Net deferred income tax liabilities | $ (6,794.0) | $ (7,294.0)

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