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Income Taxes (Details 2) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Employee benefits | $ 47 | $ 35
Terminal 5 lease | 127 | 106
Deferred Tax Assets, Gross | 476 | 462
Deferred Tax Assets, Valuation Allowance | 31 | 21
Deferred Tax Assets, Net of Valuation Allowance | 445 | 441
Deferred tax liabilities: |  |
Accelerated depreciation | (1,423) | (1,270)
Deferred Tax Liabilities, Gross | (1,696) | (1,553)
Deferred Tax Liabilities, Net | (1,251) | (1,112)
Deferred Tax Assets, Operating Loss Carryforwards | 31 | 28
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 42 | 32
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent | $ 17 | $ 20

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