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Cumulative Preferred Stock (Authorized) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	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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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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