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CAPITAL STOCK - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |
Options exercised under incentive plans (in shares) |  |  |  |  | 11,300,000.0 |
Authorized amount of stock available for repurchase |  |  | $ 1,500,000,000 |  | $ 1,500,000,000 |
Shares repurchased (in shares) |  | 22,900,000 |  | 22,900,000 |  |
Aggregate stock offering price |  | $ 143,300,000 |  | $ 143,300,000 |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Preferred stock, redemption price (in dollars per share) |  | $ 25.00 |  | $ 25.00 |  |
Preferred stock, shares issued (in shares) |  | 81,900,000 |  | 81,900,000 |  | 81,900,000
Series H |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, redemption price (in dollars per share) |  |  | $ 25.00 |  | $ 25.00 |
Preferred stock dividend rate, percentage |  |  |  |  | 8.125% |
Series I |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock dividend rate, percentage |  |  |  | 6.75% | 6.75% |
Preferred stock, shares issued (in shares) |  | 17,700,000 | 16,000,000.0 | 17,700,000 | 16,000,000.0 | 17,700,000
Proceeds from issuance of preferred stock |  |  |  |  | $ 400,000,000.0 |
Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  | 75,000,000.0 |
Proceeds from sale of stock |  |  |  |  | $ 730,500,000 |
Public Offering, Additional Share Purchase Option |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  | 11,300,000 |
Proceeds from sale of stock |  |  |  |  | $ 109,600,000 |
Option to purchase additional shares, period |  |  |  |  | 30 days |
Public Offering, Additional Share Purchase Option | Series I |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 2,400,000 |  | 2,400,000 |
Preferred stock, option to purchase additional shares, period |  |  |  |  | 30 days |
At-the-market Sale Program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  | 8,000,000.0 | 0 | 56,000,000.0 |
Proceeds from sale of stock |  |  | $ 80,100,000 |  | $ 569,100,000 |
Aggregate stock offering price | $ 1,500,000,000 |  |  |  |  |
Preferred stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock redeemed |  | $ 0 | $ 55,000,000 | $ 0 | $ 55,000,000 |
Preferred stock | Series H |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock redeemed (in shares) |  |  |  |  | 2,200,000 |
Preferred stock redeemed |  |  |  |  | $ 55,000,000.0 |

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