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STOCK-BASED COMPENSATION - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 25, 2021 | Feb. 10, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Mar. 22, 2021
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Stock compensation expense |  |  | $ 206 | $ 137 | $ 521 | $ 368 |  |
Total of Class A and Class B common stock, repurchased, value |  |  |  |  |  | $ 231 |  |
Common stock purchases |  |  | 0 | 0 | 0 | 2,100,000 |  |
Share repurchase authorization available |  |  | $ 2,100 |  | $ 2,100 |  |  |
Tangible Asset Impairment Charges |  |  | 0 | $ 0 | 24 | $ 0 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Reclassification to earnings, tax effect |  |  | 0 | (1) | 0 | (1) |  |
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 |  |  | 1,569 | 0 | 6,470 | 0 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  |  | 25 | 44 |  |  |  |
Other Comprehensive Income Net Actuarial Gains and Prior Service Cost Arising During Period, Tax |  |  | $ 495 | $ 0 | 2,039 | 0 |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Remeasurement of plan assets and liabilities (net of tax effect of $0 and $214) (1) |  |  |  |  | $ (2,450) | $ 87 |  |
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) |  |  |  |  | $ 167.26 |  | $ 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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