FAIR VALUE MEASUREMENTS - Defined benefit plan assets (Details) - Fair Value, Recurring £ in Millions, $ in Millions	Dec. 31, 2021 USD ($)	Dec. 31, 2021 GBP (£)	Dec. 31, 2020 USD ($)
United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 177		$ 187
United States | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	1		20
United States | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	176		167
United States | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	129		81
United States | Fixed income securities | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	129		81
United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	28		64
United States | Equity securities | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	28		64
United States | Alternative credit fund
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	19		22
United States | Alternative credit fund | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	19		22
United States | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	1
United States | Cash | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0
United States | Real estate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount			20
United States | Real estate and other | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount			0
United States | Valuation, Market Approach | Fixed income securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Fixed income securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Fixed income securities | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Equity securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Equity securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Equity securities | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Alternative credit fund | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Alternative credit fund | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Alternative credit fund | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
United States | Valuation, Market Approach | Cash | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	1
United States | Valuation, Market Approach | Cash | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0
United States | Valuation, Market Approach | Cash | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0
United States | Valuation, Market Approach | Real estate and other | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount			20
United States | Valuation, Market Approach | Real estate and other | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount			0
United States | Valuation, Market Approach | Real estate and other | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount			0
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	2,049		2,041
Non-U.S. | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	941		181
Non-U.S. | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	18		0
Non-U.S. | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	235		199
Non-U.S. | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	855		1,661
Non-U.S. | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	710		1,123
Non-U.S. | Fixed income securities | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	594		1,072
Non-U.S. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	412		283
Non-U.S. | Equity securities | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	49		283
Non-U.S. | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	338		130
Non-U.S. | Cash | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Insurance contract
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	108		113
Non-U.S. | Insurance contract | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Real estate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	481		392
Non-U.S. | Real estate and other | Fair Value Measured at Net asset value (NAV)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	212		306
Non-U.S. | Valuation, Market Approach | Fixed income securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	116		51
Non-U.S. | Valuation, Market Approach | Fixed income securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Valuation, Market Approach | Fixed income securities | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Valuation, Market Approach | Equity securities | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	363		0
Non-U.S. | Valuation, Market Approach | Equity securities | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Valuation, Market Approach | Equity securities | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Valuation, Market Approach | Cash | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	338	£ 122	130
Non-U.S. | Valuation, Market Approach | Cash | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Valuation, Market Approach | Cash | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Valuation, Market Approach | Insurance contract | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Valuation, Market Approach | Insurance contract | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0		0
Non-U.S. | Valuation, Market Approach | Insurance contract | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	108		113
Non-U.S. | Valuation, Market Approach | Real estate and other | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	124		0
Non-U.S. | Valuation, Market Approach | Real estate and other | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	18		0
Non-U.S. | Valuation, Market Approach | Real estate and other | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 127		$ 86