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PENSION AND OTHER POSTRETIREMENT BENEFITS - (Details 5 ) - Level 3 Fair Value Reconciliation - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
UNITED STATES |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | $ 3,548 | $ 3,429 | $ 3,357
UNITED STATES | Fair Value, Inputs, Level 3 |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 551 | 431 | 371
Unrealized gains (losses) on assets still held at the reporting date | 155 | 23 |
Purchases, sales and settlements, net | (35) | 37 |
UNITED STATES | Fair Value, Inputs, Level 3 | Private Markets |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 471 | 359 | 299
Unrealized gains (losses) on assets still held at the reporting date | 144 | 21 |
Purchases, sales and settlements, net | (32) | 39 |
UNITED STATES | Fair Value, Inputs, Level 3 | Real Assets |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 80 | 72 | 72
Unrealized gains (losses) on assets still held at the reporting date | 11 | 2 |
Purchases, sales and settlements, net | (3) | (2) |
UNITED KINGDOM |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 2,390 | 2,337 | 2,010
UNITED KINGDOM | Insurance |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 514 | 556 |
UNITED KINGDOM | Fair Value, Inputs, Level 3 |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 903 | 838 | 735
Unrealized gains (losses) on assets still held at the reporting date | 74 | 100 |
Purchases, sales and settlements, net | (9) | 3 |
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private Markets |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 356 | 251 | 224
Unrealized gains (losses) on assets still held at the reporting date | 114 | 22 |
Purchases, sales and settlements, net | (9) | 5 |
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real Assets |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 33 | 31 | 35
Unrealized gains (losses) on assets still held at the reporting date | 2 | (2) |
Purchases, sales and settlements, net | 0 | (2) |
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance |  |  |
Summary of changes in the fair value of level 3 assets |  |  |
Fair value of plan assets | 514 | 556 | $ 476
Unrealized gains (losses) on assets still held at the reporting date | (42) | 80 |
Purchases, sales and settlements, net | $ 0 | $ 0 |

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