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Income Taxes - Components Of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Deferred revenue/gains | $ 161 | $ 127
Employee benefits | 71 | 47
Foreign tax credit | 81 | 42
Net operating loss carryforward | 335 | 31
Operating lease liabilities | 204 | 212
Rent expense | 33 | 17
Total deferred tax assets | 885 | 476
Valuation allowance | (69) | (31)
Deferred tax assets, net | 816 | 445
Deferred tax liabilities: |  |
Accelerated depreciation | (1,538) | (1,423)
Operating lease assets | (197) | (236)
Other | (3) | (37)
Deferred Tax Liabilities, Gross | (1,738) | (1,696)
Deferred Tax Liabilities, Net | $ (922) | $ (1,251)

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