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Business Acquisitions - ITC Holdings (Details) CAD / shares in Units, $ / shares in Units, km in Thousands, MW in Thousands, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 14, 2016 USD ($) station km $ / shares CAD / $ shares | Oct. 14, 2016 CAD shares | Dec. 31, 2016 USD ($) station km CAD / $ | Dec. 31, 2016 CAD | Dec. 31, 2016 CAD MW | Dec. 31, 2015 CAD CAD / $ | Oct. 31, 2016 | Oct. 13, 2016 CAD / shares CAD / $
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Advances from non-controlling interests |  |  |  |  | CAD 1,361,000,000 | CAD 20,000,000 |  |
Share consideration |  |  |  |  | CAD 4,684,000,000 | CAD 0 |  |
Closing share price (CAD per share) | CAD / shares |  |  |  |  |  |  |  | CAD 40.96
Foreign exchange rate (CAD per USD) | CAD / $ | 1.32 |  | 1.34 |  |  | 1.38 |  | 1.32
ITC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Combined peak transmission line capacity (MW) (more than) | MW |  |  |  |  | 26 |  |  |
Area of operation (km) | km |  |  | 25 |  |  |  |  |
Generating facilities | station | 570 |  | 570 |  |  |  |  |
Unsecured | ITC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Face value | $ |  |  | $ 385 |  |  |  |  |
ITC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling ownership (percent) | 19.90% |  |  |  |  |  | 19.90% |
ITC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price | $ 11,800 | CAD 15,700,000,000 |  |  |  |  |  |
Consolidated indebtedness at fair value acquired | $ 4,800 | CAD 6,300,000,000 |  |  |  |  |  |
Cash paid per share (USD per share) | $ / shares | $ 22.57 |  |  |  |  |  |  |
Entity shares issued per acquiree share | shares | 0.7520 | 0.7520 |  |  |  |  |  |
Cash and share consideration given | $ 7,000 | CAD 9,342,000,000 |  |  |  |  |  |
Payment for ownership | 3,500 | CAD 4,658,000,000 |  |  |  |  |  |
Advances from non-controlling interests | $ | $ 1,228 |  |  |  |  |  |  |
Shares issued per share purchased | shares | 114,400,000 | 114,400,000 |  |  |  |  |  |
Share consideration | $ 3,500 | CAD 4,684,000,000 |  |  |  |  |  |
Combined peak transmission line capacity (MW) (more than) | MW |  |  |  |  | 26 |  |  |
Area of operation (km) | km | 25 |  |  |  |  |  |  |
Acquisition-related expenses |  |  |  |  | CAD 118,000,000 | CAD 10,000,000 |  |
Acquisition-related expenses, net of tax |  |  |  |  | 90,000,000 | 7,000,000 |  |
Accelerated vesting of the stock-based compensation awards |  |  | 17 | CAD 22,000,000 |  |  |  |
ITC | Operating expenses |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition-related expenses |  |  |  |  | 79,000,000 | 10,000,000 |  |
Acquisition-related expenses, net of tax |  |  |  |  | 62,000,000 | 7,000,000 |  |
ITC | Finance charges |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition-related expenses |  |  |  |  | 39,000,000 | 0 |  |
Acquisition-related expenses, net of tax |  |  |  |  | CAD 28,000,000 | CAD 0 |  |
ITC | ITC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Accelerated vesting of the stock-based compensation awards |  |  | $ 21 | CAD 27,000,000 |  |  |  |
ITC | Unsecured |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Face value | $ | $ 2,000 |  |  |  |  |  |  |
ITC | Unsecured | 6.00% Unsecured US Shareholder Note |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Face value | $ | 199 |  |  |  |  |  |  |
Bridge loan | ITC | Credit facility |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Drawings from non-revolving term senior unsecured equity bridge credit facility | $ 404 | CAD 535,000,000 |  |  |  |  |  |

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