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Preference Shares - Issued and Outstanding (Details) - CAD CAD in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Preferred stock shares issued (shares) | 66,200,000 | 74,194,000 |
Preference stock issued | CAD 1,623 | CAD 1,820 |
Preferred stock outstanding (shares) | 66,200,000 | 74,194,000 |
Preferred stock outstanding | CAD 1,623 | CAD 1,820 |
Series E |  |  |
Class of Stock [Line Items] |  |  |
Preference stock shares issued (shares) | 0 | 7,994,000 |
Preference shares issued | CAD 0 | CAD 197 |
Preference stock outstanding (shares) | 0 | 7,994,000 |
Preference stock outstanding | CAD 0 | CAD 197 |
Series F |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock shares issued (shares) | 5,000,000 | 5,000,000 |
Preference stock issued | CAD 122 | CAD 122 |
Preferred stock outstanding (shares) | 5,000,000 | 5,000,000 |
Preferred stock outstanding | CAD 122 | CAD 122 |
Series G |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock shares issued (shares) | 9,200,000 | 9,200,000 |
Preference stock issued | CAD 225 | CAD 225 |
Preferred stock outstanding (shares) | 9,200,000 | 9,200,000 |
Preferred stock outstanding | CAD 225 | CAD 225 |
Series H |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock shares issued (shares) | 7,025,000 | 7,025,000 | 10,000,000
Preference stock issued | CAD 172 | CAD 172 |
Preferred stock outstanding (shares) | 7,025,000 | 7,025,000 |
Preferred stock outstanding | CAD 172 | CAD 172 |
Series I |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock shares issued (shares) | 2,975,000 | 2,975,000 |
Preference stock issued | CAD 73 | CAD 73 |
Preferred stock outstanding (shares) | 2,975,000 | 2,975,000 |
Preferred stock outstanding | CAD 73 | CAD 73 |
Series J |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock shares issued (shares) | 8,000,000 | 8,000,000 |
Preference stock issued | CAD 196 | CAD 196 |
Preferred stock outstanding (shares) | 8,000,000 | 8,000,000 |
Preferred stock outstanding | CAD 196 | CAD 196 |
Series K |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock shares issued (shares) | 10,000,000 | 10,000,000 |
Preference stock issued | CAD 244 | CAD 244 |
Preferred stock outstanding (shares) | 10,000,000 | 10,000,000 |
Preferred stock outstanding | CAD 244 | CAD 244 |
Series M |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock shares issued (shares) | 24,000,000 | 24,000,000 |
Preference stock issued | CAD 591 | CAD 591 |
Preferred stock outstanding (shares) | 24,000,000 | 24,000,000 |
Preferred stock outstanding | CAD 591 | CAD 591 |

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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