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RETIREMENT BENEFITS PLANS - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |
United States pension plans percentage of worldwide pension assets | 62.00% |
United Kingdom pension plans percentage of worldwide pension assets | 29.00% |
United States pension plans' target allocation of United States equities | 19.00% |
United States pension plans' target allocation of non-United States equities | 19.00% |
United States pension plans' target allocation of real estate | 6.00% |
United State pension plans' target allocation of debt securities | 47.00% |
United States pension plans' target allocation of other, including private equity, private debt, and cash equivalents | 9.00% |
United Kingdom pension plans' target allocation of equities | 44.00% |
Unfunded commitments | $ 192 | $ 254
Total pension plan assets | 5,919 | 5,600
Pending purchases and sales of plan assets, and interest receivable | (99) | (108)
Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 806 | 696
Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 2,827 | 2,661
Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 535 | 358
Non-United States equity and global equities | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 586 | 610
Non-United States equity and global equities | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Non-United States equity and global equities | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 586 | 610
Non-United States equity and global equities | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
United States equity | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 240 | 73
United States equity | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
United States equity | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 240 | 73
United States equity | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Fixed income | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 624 | 681
Fixed income | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Fixed income | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 624 | 681
Fixed income | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Fixed income securities | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 1,074 | 1,021
Fixed income securities | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Fixed income securities | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 1,074 | 1,021
Fixed income securities | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
United States treasuries | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 417 | 316
United States treasuries | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 417 | 316
United States treasuries | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
United States treasuries | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Bank loans | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 117 | 110
Bank loans | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Bank loans | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 117 | 110
Bank loans | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Real estate | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 471 | 419
Real estate | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 237 | 221
Real estate | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 18 | 14
Real estate | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 216 | 184
Equity securities | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 2 |
Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 2 |
Equity securities | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 |
Equity securities | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 |
Cash equivalents | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 150 | 184
Cash equivalents | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 28 | 71
Cash equivalents | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 122 | 113
Cash equivalents | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Exchange traded funds | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 122 | 88
Exchange traded funds | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 122 | 88
Exchange traded funds | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Exchange traded funds | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Other | Fair Value, Inputs, Level 1, 2 and 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 365 | 213
Other | Quoted prices in active markets for identical assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 0 | 0
Other | Other observable inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 46 | 39
Other | Unobservable inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 319 | 174
Common collective and other trusts measured at net asset value | Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | 1,841 | 1,987
Money market funds measured at net asset value | Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total pension plan assets | $ 9 | $ 6

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