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Income Taxes - Components Of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Deferred revenue/gains $ 301 $ 161
Employee benefits 70 71
Foreign tax credit 83 77
Other 4 4
Net operating loss carryforward 522 335
Operating lease liabilities 189 204
Rent expense 108 120
Total deferred tax assets 1,277 972
Valuation allowance (73) (69)
Deferred tax assets, net 1,204 903
Deferred tax liabilities:    
Accelerated depreciation (1,845) (1,625)
Operating lease assets (182) (197)
Other (20) (3)
Deferred Tax Liabilities, Gross (2,047) (1,825)
Deferred Tax Liabilities, Net $ (843) $ (922)