CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS BY COMPONENT (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Total AOCI, net of tax
Balance		$ 4,893	$ 5,933
OCI, before reclassifications, net of tax		(42)	(154)
Amounts reclassified to net income, net of tax	[1]		3
Total other comprehensive loss, net of tax		(42)	(151)
Balance		4,764	3,831
Total AOCI
Total AOCI, net of tax
Balance		(118)	(191)
Balance		(160)	(342)
Foreign currency translation adjustments
Total AOCI, net of tax
Balance		(89)	(139)
OCI, before reclassifications, net of tax		(30)	(77)
Amounts reclassified to net income, net of tax	[1]		0
Total other comprehensive loss, net of tax		(30)	(77)
Balance		(119)	(216)
Foreign currency translation adjustments | Net Investment Hedging | Foreign Currency Forward
Before tax
Balance		(53)	(53)
Balance		(53)	(53)
Total AOCI, net of tax
Balance		(35)	(35)
Balance		(35)	(35)
Foreign currency translation
Before tax
Balance		11	(186)
OCI before reclassifications, before tax		(117)	(128)
Amounts reclassified to net income, before tax	[1]		0
OCI after reclassifications, before tax		(117)	(128)
Balance		(106)	(314)
Tax (expense) benefit
Balance	[2]	47	54
OCI before reclassifications, tax	[2]	4	4
Amounts reclassified to net income, tax	[1],[2]		0
OCI after reclassifications, tax	[2]	4	4
Balance	[2]	51	58
Net Investment Hedges
Before tax
Balance	[3]	(184)	(2)
OCI before reclassifications, before tax	[3]	109	62
Amounts reclassified to net income, before tax	[1],[3]		0
OCI after reclassifications, before tax	[3]	109	62
Balance	[3]	(75)	60
Tax (expense) benefit
Balance	[3]	37	(5)
OCI before reclassifications, tax	[3]	(26)	(15)
Amounts reclassified to net income, tax	[1],[3]		0
OCI after reclassifications, tax	[3]	(26)	(15)
Balance	[3]	11	(20)
Unrealized losses on cash flow hedges
Before tax
Balance	[4]	0	0
OCI before reclassifications, before tax	[4]	(15)	0
Amounts reclassified to net income, before tax	[1],[4]		0
OCI after reclassifications, before tax	[4]	(15)	0
Balance	[4]	(15)	0
Tax (expense) benefit
Balance	[4]	0	0
OCI before reclassifications, tax	[4]	4	0
Amounts reclassified to net income, tax	[1],[4]		0
OCI after reclassifications, tax	[4]	4	0
Balance	[4]	4	0
Total AOCI, net of tax
Balance	[4]	0	0
OCI, before reclassifications, net of tax	[4]	(11)	0
Amounts reclassified to net income, net of tax	[1],[4]		0
Total other comprehensive loss, net of tax	[4]	(11)	0
Balance	[4]	(11)	0
Net unrealized gains (losses) on available-for-sale securities
Before tax
Balance		3	(7)
OCI before reclassifications, before tax		(1)	(94)
Amounts reclassified to net income, before tax	[1]		4
OCI after reclassifications, before tax		(1)	(90)
Balance		2	(97)
Tax (expense) benefit
Balance		(32)	(45)
OCI before reclassifications, tax		0	17
Amounts reclassified to net income, tax	[1]		(1)
OCI after reclassifications, tax		0	16
Balance		(32)	(29)
Total AOCI, net of tax
Balance		(29)	(52)
OCI, before reclassifications, net of tax		(1)	(77)
Amounts reclassified to net income, net of tax	[1]		3
Total other comprehensive loss, net of tax		(1)	(74)
Balance		$ (30)	$ (126)

[1]    The reclassified net losses before tax from impairment and sales of investments in debt securities are included in "Other income (expense), net" and the related reclassified tax benefits are included in "Income tax benefit" in the Unaudited Consolidated Statement of Operations. The cost of marketable debt securities sold is determined using a first-in and first-out method.

[2] 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 U.S. Tax Cuts and Jobs Act (the "Tax Act").

[3] Net investment hedges balance at March 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 Note 9).

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