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Cumulative Preferred Stock (Authorized) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 CAD ($) $ / shares shares | Dec. 31, 2018 CAD ($) shares | Dec. 31, 2018 د.إ / shares shares
Class of Stock [Line Items] |  |  |
Issued and Outstanding | shares | 41,000,000 | 41,000,000 | 41,000,000
Net Proceeds | $ | $ 1,004 | $ 1,004 |
Series A Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Annual Dividend Per Share | $ 0.6388 |  |
Preferred Stock, Redemption Price Per Share | $ 25 |  |
Issued and Outstanding | shares | 3,864,636 | 3,864,636 | 3,864,636
Net Proceeds | $ | $ 95 | $ 95 |
Series B Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Redemption Price Per Share | $ 25 |  |
Issued and Outstanding | shares | 2,135,364 | 2,135,364 | 2,135,364
Net Proceeds | $ | $ 52 | $ 52 |
Series C Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Annual Dividend Per Share | (per share) | $ 1.1802 |  | د.إ 1.025
Preferred Stock, Redemption Price Per Share | $ 25 |  |
Issued and Outstanding | shares | 10,000,000 | 10,000,000 | 10,000,000
Net Proceeds | $ | $ 245 | $ 245 |
Series E Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Annual Dividend Per Share | $ 1.125 |  |
Preferred Stock, Redemption Price Per Share | $ 25.75 |  |
Issued and Outstanding | shares | 5,000,000 | 5,000,000 | 5,000,000
Net Proceeds | $ | $ 122 | $ 122 |
Series F Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Annual Dividend Per Share | $ 1.0625 |  |
Preferred Stock, Redemption Price Per Share | $ 25 |  |
Issued and Outstanding | shares | 8,000,000 | 8,000,000 | 8,000,000
Net Proceeds | $ | $ 195 | $ 195 |
Series H Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Annual Dividend Per Share | $ 1.225 |  |
Preferred Stock, Redemption Price Per Share | $ 25 |  |
Issued and Outstanding | shares | 12,000,000 | 12,000,000 | 12,000,000
Net Proceeds | $ | $ 295 | $ 295 |

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