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Capital Stock Capital Stock - RSU Transactions (Details) shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 shares | Dec. 31, 2018 | Dec. 31, 2017 shares | Dec. 31, 2016 shares
RSUs |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Outstanding, beginning balance (in shares) | 3.2 |  | 3.8 | 3.5
Granted (in shares) | 2.6 |  | 1.9 | 2.3
Settled (in shares) | (1.8) | 0 | (2.3) | (1.9)
Forfeited/Expired (in shares) | (0.2) |  | (0.2) | (0.1)
Outstanding, ending balance (in shares) | 3.8 |  | 3.2 | 3.8
LTIP |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Granted (in shares) | 0.7 |  |  |
LTIP | RSUs |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Outstanding, beginning balance (in shares) | 1.7 |  | 0.8 | 0.0
Granted (in shares) | 0.0 |  | 1.4 | 0.8
Settled (in shares) | (0.9) |  | (0.3) | 0.0
Forfeited/Expired (in shares) | (0.1) |  | (0.2) | 0.0
Outstanding, ending balance (in shares) | 0.7 |  | 1.7 | 0.8
CSUP |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Granted (in shares) | 2.5 |  |  |
CSUP | RSUs |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Outstanding, beginning balance (in shares) | 1.5 |  | 3.0 | 3.5
Granted (in shares) | 2.6 |  | 0.5 | 1.5
Settled (in shares) | (0.9) |  | (2.0) | (1.9)
Forfeited/Expired (in shares) | (0.1) |  | 0.0 | (0.1)
Outstanding, ending balance (in shares) | 3.1 |  | 1.5 | 3.0

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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