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CAPITAL STOCK - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2019
Class of Stock [Line Items] |  |  |  |  |
Authorized amount of stock available for repurchase |  |  |  | $ 1,500,000,000 | $ 1,500,000,000
Preferred stock, par value (USD per share) |  | $ 0.01 |  | $ 0.01 |
Preferred stock, redemption price (in dollars per share) |  | $ 25.00 |  |  |
At-the-market Sale Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Aggregate stock offering price | $ 1,500,000,000 |  |  |  |
Sale of stock, shares issued (in shares) |  | 0 | 0 |  |

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