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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Domestic and Foreign Income (Loss) Before Income Taxes The following table summarizes our U.S. and foreign income (loss) before income taxes:
 Year Ended December 31,
 202120202019
 (In millions)
U.S.$(274)$(2,354)$172 
Foreign236 (797)603 
Total$(38)$(3,151)$775 
Components of Income Tax Expense The following table summarizes our provision for income taxes:
 Year Ended December 31,
 202120202019
  (In millions) 
Current income tax (benefit) expense:
U.S. federal$17 $(31)$76 
State7 — 20 
Foreign68 96 198 
Current income tax expense92 65 294 
Deferred income tax (benefit) expense:
U.S. federal(137)(315)(53)
State(19)(65)(9)
Foreign11 (108)(29)
Deferred income tax (benefit) expense(145)(488)(91)
Income tax (benefit) expense$(53)$(423)$203 
Components of Deferred Tax Assets and Deferred Tax Liabilities As of December 31, 2021 and 2020, the significant components of our deferred tax assets and deferred tax liabilities were as follows:
 December 31,
 20212020
 (In millions)
Deferred tax assets:
Provision for accrued expenses$85 $91 
Deferred loyalty rewards186 180 
Net operating loss and tax credit carryforwards939 752 
Stock-based compensation25 70 
Property and equipment19 54 
Operating lease liabilities96 135 
Long-term investments106 87 
Other62 89 
Total deferred tax assets1,518 1,458 
Less valuation allowance(171)(216)
Net deferred tax assets$1,347 $1,242 
Deferred tax liabilities:
Goodwill and intangible assets(418)(422)
Anticipatory foreign tax credits(113)(98)
Operating lease ROU assets(93)(126)
Other(15)(4)
Total deferred tax liabilities$(639)$(650)
Net deferred tax assets$708 $592 
Schedule of Statutory Federal Income Tax Rate to Income from Continuing Operations before Income Taxes A reconciliation of amounts computed by applying the U.S. federal statutory income tax rate to income before income taxes to total income tax expense is as follows:
 Year Ended December 31,
 202120202019
  (In millions) 
Income tax (benefit) expense at the U.S. federal statutory rate of 21%$(8)$(662)$163 
Foreign tax rate differential3 16 40 
U.S. federal research and development credit(27)(24)(25)
Excess tax benefits related to stock-based compensation(52)6 (12)
Nondeductible compensation42 15 13 
Unrecognized tax benefits and related interest6 36 17 
Change in valuation allowance(24)139 (2)
Return to provision true-ups4 (20)(12)
State taxes(9)(48)22 
Non-deductible goodwill impairment— 170 — 
Divestitures and entity restructuring(6)(53)— 
Foreign-derived intangible income— — (14)
Other, net18 2 13 
Income tax (benefit) expense$(53)$(423)$203 
Income Tax Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits A reconciliation of the beginning and ending amount of gross unrecognized tax benefits and interest is as follows:
202120202019
  (In millions) 
Balance, beginning of year$345 $305 $293 
Increases to tax positions related to the current year11 16 12 
Increases to tax positions related to prior years3 18 5 
Decreases to tax positions related to prior years(11)(2)— 
Reductions due to lapsed statute of limitations— (4)(2)
Settlements during current year(6)— (11)
Interest and penalties7 12 8 
Balance, end of year$349 $345 $305