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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Fair Value of Pension Plan Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 3,784 | $ 3,434 |
Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 758 | 764 |
Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,928 | 1,933 |
Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 9 | 11 |
Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,089 | 726 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 368 | 265 |
Cash and cash equivalents | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 50 | 91 |
Cash and cash equivalents | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 318 | 174 |
Cash and cash equivalents | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Cash and cash equivalents | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
U.S. government and government agency issues |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 271 | 280 |
U.S. government and government agency issues | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
U.S. government and government agency issues | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 271 | 280 |
U.S. government and government agency issues | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
U.S. government and government agency issues | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 573 | 744 |
Corporate bonds | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Corporate bonds | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 573 | 744 |
Corporate bonds | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Corporate bonds | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 452 | 453 |
Common stock | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 452 | 453 |
Common stock | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Common stock | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Common stock | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 521 | 510 |
Mutual funds | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 235 | 217 |
Mutual funds | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 286 | 293 |
Mutual funds | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Mutual funds | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Common/collective trust funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,118 | 771 |
Common/collective trust funds | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Common/collective trust funds | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 358 | 341 |
Common/collective trust funds | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Common/collective trust funds | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 760 | 430 |
Partnership investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 329 | 296 |
Partnership investments | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Partnership investments | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Partnership investments | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Partnership investments | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 329 | 296 |
Other holdings |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 152 | 115 |
Other holdings | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 21 | 22 |
Other holdings | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 122 | 82 |
Other holdings | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 9 | 11 | $ 10
Other holdings | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 0 | 0 |
Collateral held on loaned securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 19 |
Collateral held on loaned securities | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 0 |
Collateral held on loaned securities | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 19 |
Collateral held on loaned securities | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 0 |
Collateral held on loaned securities | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 0 |
Collateral to be paid on loaned securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Collateral to be paid on loaned securities |  | (19) |
Collateral to be paid on loaned securities | Quoted prices in active markets for identical assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Collateral to be paid on loaned securities |  | (19) |
Collateral to be paid on loaned securities | Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Collateral to be paid on loaned securities |  | 0 |
Collateral to be paid on loaned securities | Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Collateral to be paid on loaned securities |  | 0 |
Collateral to be paid on loaned securities | Fair Value, Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Collateral to be paid on loaned securities |  | $ 0 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References No definition available. + Details
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