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Capital Stock Capital Stock - RSU Transactions (Details) shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 shares | Dec. 31, 2017 | Dec. 31, 2016 shares
RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding, beginning balance (in shares) | 3.8 |  | 3.5
Granted (in shares) | 1.9 |  | 2.3
Settled (in shares) | (2.3) | 0 | (1.9)
Forfeited/Expired (in shares) | (0.2) |  | (0.1)
Outstanding, ending balance (in shares) | 3.2 |  | 3.8
LTIP |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Granted (in shares) | 1.4 |  |
LTIP | RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding, beginning balance (in shares) | 0.8 |  | 0.0
Granted (in shares) | 1.4 |  | 0.8
Settled (in shares) | (0.3) |  | 0.0
Forfeited/Expired (in shares) | (0.2) |  | 0.0
Outstanding, ending balance (in shares) | 1.7 |  | 0.8
CSUP |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Granted (in shares) | 1.1 |  |
CSUP | RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding, beginning balance (in shares) | 3.0 |  | 3.5
Granted (in shares) | 0.5 |  | 1.5
Settled (in shares) | (2.0) |  | (1.9)
Forfeited/Expired (in shares) | 0.0 |  | (0.1)
Outstanding, ending balance (in shares) | 1.5 |  | 3.0

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