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Equity - Common Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2018 | May 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  |  |  | $ 1.48 | $ 1.480 | $ 2.095
Maximum shares issuable under forward equity sales agreement (in shares) |  |  | 15,250,000.00 |  |  |  |
Initial net price (in dollars per share) |  |  | $ 28.60 |  |  |  |
Management agreement renewal term (in years) |  |  | 1 year |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.37 |  |  |  |  |  |
At-The-Market Program |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Maximum sales under equity offering program |  | $ 594 |  | $ 750 |  |  |
Common stock issued (in shares) |  |  |  |  | 5,400,000 |  |
Net price per share (in dollars per share) |  | $ 28.27 | $ 28.27 |  | $ 28.27 |  |
Proceeds from issuance of common stock |  |  |  |  | $ 154 |  |
Forward Equity Offering |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  | 0 |  |
Common Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock issued (in shares) |  |  | 2,000,000 |  |  |  |
Net price per share (in dollars per share) |  | $ 28.60 | $ 28.60 |  | $ 28.60 |  |
Proceeds from issuance of common stock |  |  | $ 57 |  |  |  |

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