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INCOME TAXES - Types of Temporary Differences and Carry-Forwards that Significantly Effect Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets    
Employee benefits $ 235 $ 262
Net operating loss carry-forwards 771 818
Accrued expenses and other reserves 191 214
Receivables, net 11 12
Tax credits 53 49
Loyalty Program 181 367
Deferred income 98 69
Lease liabilities 336 252
Interest Limitation 163 0
Other 34 82
Deferred tax assets 2,073 2,125
Valuation allowance (984) (1,009)
Deferred tax assets after valuation allowance 1,089 1,116
Deferred Tax Liabilities    
Equity method investments (40) (29)
Property and equipment (9) (42)
Intangibles (666) (663)
Right-of-use assets (290) (197)
Self-insurance (25) (19)
Deferred tax liabilities (1,030) (950)
Net deferred taxes $ 59 $ 166