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Commitments and Contingencies (Guarantees and Letters of Credit) (Details) CAD in Millions, $ in Millions | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($) | Dec. 13, 2016 CAD | Dec. 31, 2015 CAD | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |  |  |
Guaranty Liabilities | CAD 1,577 |  |  |  |
Guarantee Obligations Current Carrying Value | 577 |  |  |  |
Letters of Credit Outstanding, Amount |  |  | CAD 37 | CAD 33 |
Other Assets, Noncurrent, Total | 9,420 |  |  | 2,974 |
TECO Energy Inc [Member] |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | 80 | $ 59 |  | CAD 124 | $ 95
Financial Standby Letter of Credit [Member] | Emera Inc | Bear Swamp Power Company Limited Liability Company [Member] |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | $ |  | 24 |  |  |
Financial Standby Letter of Credit [Member] | TECO Coal [Member] |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Repayments of Lines of Credit with Bonds on Divestiture of Subsisdiary | 54 | $ 40 |  |  |
Financial Standby Letter of Credit [Member] | Nova Scotia Power Inc. [Member] | Pension Plan [Member] |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | CAD 47 |  |  |  |

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