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STOCK-BASED COMPENSATION - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 25, 2021 | Feb. 10, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Mar. 22, 2021
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Stock compensation expense |  |  | $ 179 | $ 140 | $ 700 | $ 508 |  |
Impairment charges on property plant and equipment |  |  | 0 | 0 | 30 | 0 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Reclassification to earnings, tax effect |  |  | 0 | 0 | 0 | (1) |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Net actuarial gain (loss) resulting from remeasurements of plan assets and liabilities (net of tax effect of $2,039 and $0) |  |  |  |  | 6,470 | 0 |  |
Reclassification to earnings (net of tax effect of $9 and $13) |  |  | $ 29 | $ 43 | 2,421 | (130) |  |
Net actuarial gain (loss) resulting from remeasurements of plan assets and liabilities, tax effect |  |  |  |  | $ 2,039 | $ 0 |  |
Management Incentive Award |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Closing New York Stock Exchange price |  | $ 165.66 |  |  |  |  |  | $ 161.06
Long-Term Incentive Performance Award |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |
Weighted-average fair value of options granted (usd per share) |  |  |  |  | $ 167.31 |  | $ 92.77 |
Long-Term Incentive Performance Award | Restricted Units | Year 2020 |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Weighted-average fair value of options granted (usd per share) | $ 167.66 |  |  |  |  |  |  |
Long-Term Incentive Performance Award | Restricted Units | Year 2021 |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Weighted-average fair value of options granted (usd per share) | $ 166.52 |  |  |  |  |  |  |
Nonqualified Stock Options |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 5 years |  |  |
Percentage of the award vesting at each anniversary date of the grant |  |  |  |  | 20.00% |  |  |
Expiration period (in years) |  |  |  |  | 10 years |  |  |
Stock options granted |  |  | 200,000 |  |  |  |  |
Weighted-average fair value of options granted (usd per share) |  | $ 165.66 |  |  |  |  |  |

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