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STOCK-BASED COMPENSATION - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 25, 2021 | Feb. 10, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Mar. 22, 2021
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Stock compensation expense |  |  | $ 315 | $ 231 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | 2,100 |  |  |
Tangible Asset Impairment Charges |  |  | 24 | 0 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Reclassification to earnings, tax effect |  |  | 0 | 0 |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax |  |  | 4,901 | 0 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  |  | (2,475) | 43 |  |
Other Comprehensive Income Net Actuarial Gains and Prior Service Cost Arising During Period, Tax |  |  | $ 1,544 | $ 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) |  |  | $ 167.17 |  | $ 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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