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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT
 12 Months Ended
Dec. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT
 
The table below presents the changes in the balances of accumulated other comprehensive income (loss) ("AOCI") by component for the years ended December 31, 2018, 2019 and 2020 (in millions):
Foreign currency translation adjustments, net of tax
Net unrealized gains (losses) on available-for-sale securities, net of tax (1)
Total AOCI, net of tax
Foreign currency translation
Net investment
hedges (2)
Total, net of taxBefore taxTax (expense) benefitTotal, net of tax
Before tax
Tax benefit (expense)(3)
Before taxTax benefit (expense)
Balance, December 31, 2017$210 $— $(290)$65 $(15)$343 $(90)$253 $238 
Other Comprehensive Income (Loss) ("OCI") before
reclassifications		(319)41 217 (53)(114)(201)2 (199)(313)
OCI for the period(319)41 217 (53)(114)(201)2 (199)(313)
Amounts reclassified to retained earnings (1)
— — — — — (299)58 (241)(241)
Balance, December 31, 2018$(109)$41 $(73)$12 $(129)$(157)$(30)$(187)$(316)
OCI before reclassifications(77)13 71 (17)(10)161 (37)124 114 
Amounts reclassified to
  net income (4)
— — — — — (11)22 11 11 
OCI for the period(77)13 71 (17)(10)150 (15)135 125 
Balance, December 31, 2019$(186)$54 $(2)$(5)$(139)$(7)$(45)$(52)$(191)
OCI before reclassifications197 (7)(182)42 50 6 (1)5 55 
Amounts reclassified to
  net income (4)
— — — — — 4 14 18 18 
OCI for the period197 (7)(182)42 50 10 13 23 73 
Balance, December 31, 2020$11 $47 $(184)$37 $(89)$3 $(32)$(29)$(118)
(1)         Upon the adoption of the accounting update on financial instruments on January 1, 2018, the Company reclassified net unrealized gains, net of tax, of $241 million ($299 million before tax) related to marketable equity securities from AOCI to retained earnings. Changes in fair value of marketable equity securities subsequent to January 1, 2018 are recognized in net income rather than "Accumulated other comprehensive loss" in the Consolidated Balance Sheets (see Note 2).
(2)         Net investment hedges balance, net of tax, at December 31, 2020 and earlier dates presented above, includes accumulated net losses from fair value adjustments of $35 million ($53 million before tax) associated with previously settled derivatives that were designated as net investment hedges. The remaining balances relate to foreign currency transaction gains (losses) and related tax benefits (expenses) associated with the Company's Euro-denominated debt that is designated as a hedge against the impact of currency fluctuations on the net assets of a Euro functional currency subsidiary (see Notes 2 and 12).
(3)         The tax benefits relate to foreign currency translation adjustments to the Company's one-time deemed repatriation tax liability recorded at December 31, 2017 and foreign earnings for periods after December 31, 2017 that are subject to U.S. federal and state income tax, resulting from the enactment of the Tax Act.
(4)         The reclassified net gains (losses) on available-for-sale securities, before tax, are included in "Other income (expense), net" and the reclassified tax (expenses) benefits are included in "Income tax expense" in the Consolidated Statements of Operations. For the year ended December 31, 2020, the reclassified tax expenses include a tax expense of $15 million related to the maturity in May 2020 of the Company's investment of $250 million in Trip.com Group convertible senior notes (see Note 5). For the year ended December 31, 2019, the reclassified tax expenses include a tax expense of $21 million related to the maturity in August 2019 of the Company's investment of $500 million in Trip.com Group convertible senior notes.