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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2021	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Net tax charge related to re-organizations and disentanglements		$ 157
Effective income tax rate reconciliation, change in enacted tax rate, amount		43
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance		51
Effective income tax rate reconciliation, repatriation of foreign earnings, amount		46
Effective income tax rate reconciliation, tax settlement, amount			$ 149
Unrecognized tax benefits		251	$ 166	$ 162	$ 316
Tax adjustments, settlements and unusual provisions, non-cash gain	$ 166
Tax adjustments, settlements and unusual provisions, non-cash gain, interest	$ 16
Undistributed earnings of foreign subsidiaries		6,000
Discontinued Operations, Held-for-sale
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Future income tax benefits and future income tax payables, classified as held for sale		266
United Kingdom
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Tax adjustment due to foreign tax credits		70
Germany
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Tax adjustment due to foreign tax credits		21
Minimum
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Decrease in unrecognized tax benefits is reasonably possible		10
Maximum
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Decrease in unrecognized tax benefits is reasonably possible		$ 65

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