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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

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