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Common Equity - Common Stock Dividends (Details) - $ / shares | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dividends Paid and Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) |  | $ 0.5525 | $ 0.5525 | $ 0.5525 | $ 0.5525 |  | $ 2.21 | $ 2.08 | $ 1.98
Subsequent event |  |  |  |  |  |  |  |  |
Dividends Paid and Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) | $ 0.59 |  |  |  |  |  |  |  |
Annualized dividend (in dollars per share) |  |  |  |  |  | $ 2.36 |  |  |
Subsequent event | Minimum |  |  |  |  |  |  |  |  |
Dividends Paid and Payable [Line Items] |  |  |  |  |  |  |  |  |
Target dividend payout ratio (as a percent) |  |  |  |  |  | 65.00% |  |  |
Subsequent event | Maximum |  |  |  |  |  |  |  |  |
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://fasb.org/us-gaap/role/ref/legacyRef -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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