CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS BY COMPONENT (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019	May 31, 2020	Aug. 31, 2019
Total, net of tax
Balance, beginning of period		$ 4,893		$ 5,933	$ 8,785
OCI before reclassifications		135		55	114
Amounts reclassified to net income	[2]	(161)	[1]	18	11
Total other comprehensive (loss) income, net of tax		(26)		73	125
Balance, end of period		6,178		4,893	5,933
Convertible debt securities | Trip.com Group
Total, net of tax
Investment in convertible notes		500		525		$ 250	$ 500
Foreign currency translation adjustments
Total, net of tax
Balance, beginning of period		(89)		(139)	(129)
OCI before reclassifications		(57)		50	(10)
Amounts reclassified to net income	[2]	0	[1]	0	0
Total other comprehensive (loss) income, net of tax		(57)		50	(10)
Balance, end of period		(146)		(89)	(139)
Foreign currency translation adjustments | Foreign Exchange Forward | Net Investment Hedging
Before tax
Balance, beginning of period		(53)		(53)	(53)
Balance, end of period		(53)		(53)	(53)
Total, net of tax
Balance, beginning of period		(35)		(35)	(35)
Balance, end of period		(35)		(35)	(35)
Foreign Currency Translation Adjustments - Foreign Currency Translation
Before tax
Balance, beginning of period		11		(186)	(109)
OCI before reclassifications		(287)		197	(77)
Amounts reclassified to net income	[2]	0	[1]	0	0
OCI for the period		(287)		197	(77)
Balance, end of period		(276)		11	(186)
Tax
Balance, beginning of period	[3]	47		54	41
OCI before reclassifications	[3]	20		(7)	13
Amounts reclassified to net income	[2],[3]	0	[1]	0	0
OCI for the period	[3]	20		(7)	13
Balance, end of period	[3]	67		47	54
Foreign Currency Translation Adjustments - Net Investment Hedges
Before tax
Balance, beginning of period	[4]	(184)		(2)	(73)
OCI before reclassifications	[4]	275		(182)	71
Amounts reclassified to net income	[2],[4]	0	[1]	0	0
OCI for the period	[4]	275		(182)	71
Balance, end of period	[4]	91		(184)	(2)
Tax
Balance, beginning of period	[4]	37		(5)	12
OCI before reclassifications	[4]	(65)		42	(17)
Amounts reclassified to net income	[2],[4]	0	[1]	0	0
OCI for the period	[4]	(65)		42	(17)
Balance, end of period	[4]	(28)		37	(5)
Unrealized losses on cash flow hedges
Before tax
Balance, beginning of period	[5]	0		0	0
OCI before reclassifications	[5]	(15)		0	0
Amounts reclassified to net income	[2],[5]	15	[1]	0	0
OCI for the period	[5]	0		0	0
Balance, end of period	[5]	0		0	0
Tax
Balance, beginning of period	[5]	0		0	0
OCI before reclassifications	[5]	4		0	0
Amounts reclassified to net income	[2],[5]	(4)	[1]	0	0
OCI for the period	[5]	0		0	0
Balance, end of period	[5]	0		0	0
Total, net of tax
Balance, beginning of period	[5]	0		0	0
OCI before reclassifications	[5]	(11)		0	0
Amounts reclassified to net income	[2],[5]	11	[1]	0	0
Total other comprehensive (loss) income, net of tax	[5]	0		0	0
Balance, end of period	[5]	0		0	0
Net unrealized gains (losses) on available-for-sale securities
Before tax
Balance, beginning of period		3		(7)	(157)
OCI before reclassifications		265		6	161
Amounts reclassified to net income	[2]	(265)	[1]	4	(11)
OCI for the period		0		10	150
Balance, end of period		3		3	(7)
Tax
Balance, beginning of period		(32)		(45)	(30)
OCI before reclassifications		(62)		(1)	(37)
Amounts reclassified to net income	[2]	93	[1]	14	22
OCI for the period		31		13	(15)
Balance, end of period		(1)		(32)	(45)
Total, net of tax
Balance, beginning of period		(29)		(52)	(187)
OCI before reclassifications		203		5	124
Amounts reclassified to net income	[2]	(172)	[1]	18	11
Total other comprehensive (loss) income, net of tax		31		23	135
Balance, end of period		2		(29)	(52)
Net unrealized gains (losses) on available-for-sale securities | Grab
Before tax
Amounts reclassified to net income		(265)
Total, net of tax
Amounts reclassified to net income		(203)
Net unrealized gains (losses) on available-for-sale securities | Convertible debt securities | Trip.com Group
Tax
Amounts reclassified to net income		31		15	21
Total AOCI, net of tax
Total, net of tax
Balance, beginning of period		(118)		(191)	(316)
Balance, end of period		$ (144)		$ (118)	$ (191)

[1] For the year ended December 31, 2021, amounts reclassified to net income includes a gain of $203 million ($265 million before tax) related to the Company's investment in Grab, which was reclassified from available-for-sale debt securities to equity securities with readily determinable fair values (see Note 5).

[2] 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. The cost of marketable debt securities sold is determined using a first-in and first-out method. For the year ended December 31, 2021, the reclassified tax expenses include a tax expense of $31 million related to the redemption in December 2021 of the Company's investment of $500 million in Trip.com Group convertible senior notes (see Note 5). For the years ended December 31, 2020 and 2019, the reclassified tax expenses include a tax expense of $15 million and $21 million, related to the maturity in May 2020 of the Company's investment of $250 million in Trip.com Group convertible senior notes and the maturity in August 2019 of the Company's investment of $500 million in Trip.com Group convertible senior notes, respectively.

[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] Net investment hedges balance at December 31, 2021 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 of the foreign currency exposure of the net investment in certain Euro functional currency subsidiaries (see Notes 2 and 12).

[5] Relates to the reverse treasury lock agreements entered in March 2021 that were designated as cash flow hedges and settled in April 2021 (see Note 6).