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Common Equity - Common Stock Dividends (Details) - $ / shares | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Dividends Paid and Payable [Line Items] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.4950 | $ 0.4950 | $ 0.4950 | $ 0.4950 | $ 1.98 | $ 1.74 | $ 1.56
Subsequent event |  |  |  |  |  |  |  |
Dividends Paid and Payable [Line Items] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.52 |  |  |  |  |  |  |
Annualized dividend | $ 2.08 |  |  |  |  |  |  |
Minimum | Subsequent event |  |  |  |  |  |  |  |
Dividends Paid and Payable [Line Items] |  |  |  |  |  |  |  |
Target dividend payout ratio (as a percent) | 65.00% |  |  |  |  |  |  |
Maximum | Subsequent event |  |  |  |  |  |  |  |
Dividends Paid and Payable [Line Items] |  |  |  |  |  |  |  |
Target dividend payout ratio (as a percent) | 70.00% |  |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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