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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