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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |
Shares repurchased and retired (in shares) | 2.1 | 3.0 | 7.5 | 22.4 |  |
Value of shares repurchased and retired | $ 145,000,000 | $ 201,000,000 | $ 497,000,000 | $ 1,600,000,000 |  |
Remaining authorized repurchase amount under stock repurchase programs | $ 6,300,000,000 |  | $ 6,300,000,000 |  |  |
2016 Stock Repurchase Program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Authorized amount under stock repurchase program |  |  |  |  |  | $ 12,000,000,000
2020 Stock Repurchase Program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Authorized amount under stock repurchase program |  |  |  |  | $ 5,000,000,000 |

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