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CAPITAL STOCK - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 07, 2018 | Jan. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Class of Stock [Line Items] |  |  |  |  |  |
Authorized amount of stock available for repurchase |  |  |  |  |  | $ 1,500,000,000
Shares repurchased (in shares) |  |  | 26,200,000 |  |  |
Shares repurchased (in shares) |  |  | $ 223,200,000 |  |  |
Options exercised under incentive plans (in shares) |  |  |  | 11,300,000.0 | 11,300,000.0 |
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 | 73,400,000 |
7.625% Series C Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, redemption price (in dollars per share) |  |  | $ 25.00 | $ 25.00 |  |
Preferred stock redeemed (in shares) |  |  |  | 7,000,000.0 | 5,000,000.0 |
Preferred stock dividend rate, percentage |  |  |  | 7.625% |  |
Redemption of preferred stock |  |  |  | $ 175,000,000.0 | $ 125,000,000.0 |
Preferred stock, shares issued (in shares) |  |  | 0 | 0 | 7,000,000 |
8.125% Series H Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, redemption price (in dollars per share) |  |  | $ 25.00 | $ 25.00 |  |
Preferred stock redeemed (in shares) |  |  |  | 2,200,000 |  |
Preferred stock dividend rate, percentage |  |  |  | 8.125% |  |
Redemption of preferred stock |  |  |  | $ 55,000,000.0 |  |
Preferred stock, shares issued (in shares) |  |  | 0 | 0 | 2,200,000 |
Series I Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock dividend rate, percentage |  |  |  | 6.75% |  |
Preferred stock, shares issued (in shares) |  |  | 17,700,000 | 17,700,000 | 0 |
Proceeds from issuance of redeemable preferred stock |  |  |  | $ 442,500,000 |  |
6.50% Series G Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock dividend rate, percentage |  |  |  | 6.50% | 6.50% |
Preferred stock, shares issued (in shares) |  |  | 17,000,000 | 17,000,000 | 17,000,000.0 |
Proceeds from issuance of redeemable preferred stock |  |  |  |  | $ 425,000,000.0 |
7.625% Series E Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock redeemed (in shares) |  |  |  |  | 11,500,000 |
Preferred stock dividend rate, percentage |  |  |  |  | 7.625% |
Redemption of preferred stock |  |  |  |  | $ 287,500,000 |
Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  | 75,000,000.0 | 75,000,000.0 |
Proceeds from sale of stock |  |  |  | $ 730,500,000 | $ 762,800,000 |
Public Offering, Additional Share Purchase Option |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  | 11,300,000 | 11,300,000 |
Proceeds from sale of stock |  |  |  | $ 109,600,000 | $ 114,400,000 |
Option to purchase additional shares, period |  |  |  | 30 days | 30 days |
At-the-market Sale Program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  | 56,000,000.0 | 24,000,000.0 |
Proceeds from sale of stock |  |  |  | $ 569,100,000 | $ 251,100,000 |
Aggregate stock offering price |  | $ 1,500,000,000 |  |  |  |
Mountain Merger Sub Corporation |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued as part of the consideration for asset acquisition (in shares) | 43,600,000 |  |  |  | 43,600,000 |
Mountain Merger Sub Corporation | 8.125% Series H Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |

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