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Acquisition (Purchase Consideration) (Details) - TECO Energy Inc [Member] $ / shares in Units, CAD in Millions, $ in Millions | Jul. 01, 2016 CAD | Jul. 01, 2016 USD ($) | Aug. 02, 2016 CAD | Jul. 01, 2016 USD ($) $ / shares
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Business Combination, Consideration Transferred [Abstract] |  |  |  |
Business Acquisition, Share Price |  |  |  | $ 27.55
Payments to Acquire Businesses, Gross | CAD 8,400 | $ 6,500 |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 5,500 | 4,200 |  |
Business Combination, Consideration Transferred | 13,900 | $ 10,700 |  |
Short-Term Debt/Long-Term Debt [Abstract] |  |  |  |
Convertible Debt | 728 |  | CAD 1,400 | $ 560
Junior Subordinated Notes, Noncurrent | 1,560 |  |  | 1,200
Other Long-term Debt, Noncurrent | 500 |  |  | 384
Senior Notes, Noncurrent | 4,200 |  |  | 3,250
Line of Credit Facility, Fair Value of Amount Outstanding | CAD 1,400 |  |  | $ 1,100

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