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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)