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Common Equity - Dividend Restrictions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) period | Dec. 31, 2017
Dividend Payment Restrictions [Line Items] |  |
Junior notes minimum interest deferral payment period (in periods) | period | 1 |
Junior notes maximum interest payment deferral period (in years) | 10 years |
Restricted net assets of consolidated subsidiaries | $ 6,800 |
Undistributed earnings of investees accounted for by the equity method | $ 383 |
WE |  |
Dividend Payment Restrictions [Line Items] |  |
Maximum debt to capitalization ratio | 65.00% |
WE | $100 par value, Serial Preferred Stock, 3.60% series |  |
Dividend Payment Restrictions [Line Items] |  |
Dividend rate (as a percent) | 3.60% | 3.60%
WE | $100 par value, Serial Preferred Stock, 3.60% series | Common stock equity to total capitalization is less than 25% |  |
Dividend Payment Restrictions [Line Items] |  |
Percentage of common equity to total capitalization required to be maintained | 25.00% |
WE | $100 par value, Serial Preferred Stock, 3.60% series | Common stock equity to total capitalization is less than 20% |  |
Dividend Payment Restrictions [Line Items] |  |
Percentage of common equity to total capitalization required to be maintained | 20.00% |
WE | Minimum | Public Service Commission of Wisconsin |  |
Dividend Payment Restrictions [Line Items] |  |
Common equity ratio required to be maintained (as a percent) | 51.00% |
WE | Maximum | $100 par value, Serial Preferred Stock, 3.60% series | Common stock equity to total capitalization is less than 25% |  |
Dividend Payment Restrictions [Line Items] |  |
Percentage of net income for which dividends can be declared | 75.00% |
WE | Maximum | $100 par value, Serial Preferred Stock, 3.60% series | Common stock equity to total capitalization is less than 20% |  |
Dividend Payment Restrictions [Line Items] |  |
Percentage of net income for which dividends can be declared | 50.00% |
WG | Minimum | Public Service Commission of Wisconsin |  |
Dividend Payment Restrictions [Line Items] |  |
Common equity ratio required to be maintained (as a percent) | 49.50% |
WPS |  |
Dividend Payment Restrictions [Line Items] |  |
Maximum debt to capitalization ratio | 65.00% |
WPS | Minimum | Public Service Commission of Wisconsin |  |
Dividend Payment Restrictions [Line Items] |  |
Common equity ratio required to be maintained (as a percent) | 51.00% |
ATC Holding LLC |  |
Dividend Payment Restrictions [Line Items] |  |
Maximum debt to capitalization ratio | 65.00% |
Bluewater Gas Storage, LLC |  |
Dividend Payment Restrictions [Line Items] |  |
Maximum debt to capitalization ratio | 65.00% |

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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