RELATED PARTY TRANSACTIONS - Allocation of Corporate Expenses (Details) - IBM - Management Costs And Corporate Support Services - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Related Party Transaction [Line Items]
Allocation of corporate expenses	$ 0	$ 337
Other (income) and expense.
Related Party Transaction [Line Items]
Allocation of corporate expenses		7
Interest expense.
Related Party Transaction [Line Items]
Allocation of corporate expenses		14
Selling, general and administrative expense.
Related Party Transaction [Line Items]
Allocation of corporate expenses		$ 317