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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 4) - Fair Value of Plan Assets - USD ($) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 31, 2012 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
UNITED STATES |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | $ 3,548 | $ 3,429 | $ 3,357
Pending Trade Purchases, Sales |  | 2 |  |
Accrued Investment Income Receivable |  | 6 | 5 |
UNITED STATES | U.S. Equity |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 115 | 194 |
UNITED STATES | Non-U.S. Equity |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 38 | 58 |
UNITED STATES | Government debt |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 67 | 83 |
UNITED STATES | Domestic Corporate Debt Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 489 | 512 |
UNITED STATES | Foreign Corporate Debt Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 19 | 26 |
UNITED STATES | Asset-backed Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  |  | 3 |
UNITED STATES | Net cash equivalents |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 327 | 356 |
UNITED STATES | Private markets and real assets (2) |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 551 | 431 |
UNITED STATES | Fair Value, Inputs, Level 1 |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 460 | 649 |
UNITED STATES | Fair Value, Inputs, Level 1 | U.S. Equity |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 115 | 194 |
UNITED STATES | Fair Value, Inputs, Level 1 | Non-U.S. Equity |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 38 | 58 |
UNITED STATES | Fair Value, Inputs, Level 1 | Government debt |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 37 | 78 |
UNITED STATES | Fair Value, Inputs, Level 1 | Net cash equivalents |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 270 | 319 |
UNITED STATES | Significant other observable inputs Level 2 |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 595 | 583 |
UNITED STATES | Significant other observable inputs Level 2 | Government debt |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 30 | 5 |
UNITED STATES | Significant other observable inputs Level 2 | Domestic Corporate Debt Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 489 | 512 |
UNITED STATES | Significant other observable inputs Level 2 | Foreign Corporate Debt Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 19 | 26 |
UNITED STATES | Significant other observable inputs Level 2 | Asset-backed Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  |  | 3 |
UNITED STATES | Significant other observable inputs Level 2 | Net cash equivalents |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 57 | 37 |
UNITED STATES | Fair Value, Inputs, Level 3 |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 551 | 431 | 371
UNITED STATES | Fair Value, Inputs, Level 3 | Private markets and real assets (2) |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 551 | 431 |
UNITED STATES | Fair Value, Inputs, Level 3 | Real Assets |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 80 | 72 | 72
UNITED STATES | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 1,606 | 1,663 |
UNITED STATES | Fair Value Measured at Net Asset Value Per Share |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 1,934 | 1,761 |
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Government debt |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 361 | 199 |
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 262 | 96 |
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 995 | 1,068 |
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Global Equities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 145 | 245 |
UNITED STATES | Fair Value Measured at Net Asset Value Per Share | Real Assets |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 171 | 153 |
UNITED KINGDOM |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 2,390 | 2,337 | 2,010
UNITED KINGDOM | U.S. Equity |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 79 | 56 |
UNITED KINGDOM | Non-U.S. Equity |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 74 | 69 |
UNITED KINGDOM | Net cash equivalents |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 35 | 26 |
UNITED KINGDOM | Insurance |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 514 | 556 |
Insurance Contract Payment Deferment Period | 10 years |  |  |
UNITED KINGDOM | Private markets and real assets (3) |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 389 | 282 |
UNITED KINGDOM | Fair Value, Inputs, Level 1 |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 35 | 26 |
UNITED KINGDOM | Fair Value, Inputs, Level 1 | Net cash equivalents |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 35 | 26 |
UNITED KINGDOM | Significant other observable inputs Level 2 |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 153 | 125 |
UNITED KINGDOM | Significant other observable inputs Level 2 | U.S. Equity |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 79 | 56 |
UNITED KINGDOM | Significant other observable inputs Level 2 | Non-U.S. Equity |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 74 | 69 |
UNITED KINGDOM | Fair Value, Inputs, Level 3 |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 903 | 838 | 735
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real Assets |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 33 | 31 | 35
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 514 | 556 | $ 476
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private markets and real assets (3) |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 389 | 282 |
UNITED KINGDOM | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 1,091 | 989 |
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 1,299 | 1,348 |
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Asset-backed Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 99 | 100 |
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Corporate Debt Securities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 894 | 970 |
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Global Equities |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 194 | 168 |
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Diversified Strategies |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | 51 | 50 |
UNITED KINGDOM | Fair Value Measured at Net Asset Value Per Share | Reinsurance |  |  |  |
Pension and other postretirement benefits |  |  |  |
Fair value of plan assets |  | $ 61 | $ 60 |

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