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STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock compensation expense | $ 24 | $ 220 | $ 1,568
Stock-based payment arrangement, expense, tax benefit | (18) | 42 | 451
Restricted Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment arrangement, exercise of option, tax benefit | $ 110 | $ 201 | $ 352
Granted (in dollars per share) | $ 147.22 | $ 185.66 | $ 223.72
Vested in period, fair value | $ 11 | $ 1,100 | $ 923
Nonvested award, cost not yet recognized, amount | $ 3 |  |
Nonvested award, cost not yet recognized, period for recognition | 2 years |  |
Restricted Performance Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 156.73 | $ 198.78 | $ 227.00
Vested in period, fair value | $ 23 | $ 111 | $ 239
Nonvested award, cost not yet recognized, amount | $ 104 |  |
Nonvested award, cost not yet recognized, period for recognition | 1 year 10 months |  |
Nonqualified Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting (exercisable) period of awards | 5 years |  |
Nonvested award, cost not yet recognized, amount | $ 3 |  |
Nonvested award, cost not yet recognized, period for recognition | 3 years |  |
Expiration period | 10 years |  |
Proceeds from stock options exercised | $ 3 | 20 | 14
Options, exercises in period, intrinsic value | $ 2 | $ 15 | $ 20
Nonqualified Stock Options | Granted between 2019 and 2022 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of the award vesting at each anniversary date of the grant | 20.00% |  |
Nonqualified Stock Options | Granted prior to 2019 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of the award vesting at each anniversary date of the grant | 20.00% |  |
Nonqualified Stock Options | Tranche Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of the award vesting at each anniversary date of the grant | 20.00% |  |
Nonqualified Stock Options | Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of the award vesting at each anniversary date of the grant | 20.00% |  |
Nonqualified Stock Options | Tranche Four |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of the award vesting at each anniversary date of the grant | 20.00% |  |
Incentive Compensation Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 25,000,000 |  |
Number of shares available for grant | 9,000,000 |  |
Incentive Compensation Plan | Restricted Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Decrease in number of shares available for grant for each share of award granted | 1 |  |
Management Incentive Award | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation paid in restricted units |  |  | 50.00%
Management Incentive Award | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation paid in restricted units |  |  | 66.67%
Management Incentive Award | Granted between 2019 and 2022 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock compensation expense |  |  | $ 505
Management Incentive Award | Granted between 2019 and 2022 | U.S. Domestic Package |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock compensation expense |  |  | $ 431
Long Term Incentive Performance Award | Restricted Performance Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting (exercisable) period of awards | 3 years |  |
Long Term Incentive Performance Award | Restricted Performance Units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Consolidated adjusted earnings per share | 50.00% |  |
Adjusted cumulative free cash flow | (20.00%) |  |
Long Term Incentive Performance Award | Restricted Performance Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Adjusted cumulative free cash flow | 50.00% |  |
Award modifier related to total shareowner return relative to S&P 500 Index | 20.00% |  |
Discounted Employee Stock Purchase Modified Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercisable price percentage of closing price of another class of stock | 95.00% |  |
Discounted Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued, employee stock purchase plans (in shares) | 800,000 | 700,000 | 600,000
Shares issued, employee stock purchase plan, average price per share (in dollars per share) | $ 130.14 | $ 162.34 | $ 180.80

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