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Equity - Common Stock Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 02, 2018 | Feb. 01, 2018 | Jun. 30, 2015 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1.48 | $ 2.095 | $ 2.260
Dividends paid per common share (in dollars per share) |  |  |  | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.58 | $ 0.58 | $ 0.58 | $ 1.480 | $ 2.095 | $ 2.260
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  | $ 0.37 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per common share (in dollars per share) | $ 0.37 |  |  |  |  |  |  |  |  |  |  |  |  |
At-The-Market Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum sales under equity offering program |  |  | $ 750 |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.8
Weighted average price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40.14
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73
Stock issuance fees and commissions |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1

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