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Share-Based Compensation - Share Unit Plans - (Details) shares in Thousands, EquityInstruments in Thousands | 12 Months Ended
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Dec. 31, 2017 EquityInstruments shares | Dec. 31, 2016 EquityInstruments shares
Performance Share Units (PSUs) |  |
Share based compensation |  |
Vesting period | 3 years |
Outstanding, beginning of year | 2,413 | 2,465
Granted | 1,570 | 1,683
Redeemed for cash | shares | (1,663) | (1,714)
Forfeited/expired | shares | (53) | (21)
Outstanding, end of year | 2,267 | 2,413
Performance Share Units (PSUs) | Minimum |  |
Share based compensation |  |
Percentage of share price receivable at the time of vesting | 0.00% |
Performance Share Units (PSUs) | Maximum |  |
Share based compensation |  |
Percentage of share price receivable at the time of vesting | 200.00% |
Restricted Share Units (RSUs) |  |
Share based compensation |  |
Vesting period | 3 years |
Outstanding, beginning of year | 18,158 | 19,104
Granted | 5,009 | 6,194
Redeemed for cash | shares | (6,354) | (6,649)
Forfeited/expired | shares | (741) | (491)
Outstanding, end of year | 16,072 | 18,158
Deferred Share Units (DSUs) |  |
Share based compensation |  |
Outstanding, beginning of year | 1,218 | 1,072
Granted | 202 | 186
Redeemed for cash | shares | (118) | (40)
Outstanding, end of year | 1,302 | 1,218
Director | Deferred Share Units (DSUs) |  |
Share based compensation |  |
First increments of share price receivable by executives at the time of vesting | 50.00% |
Second increments of share price receivable by executives at the time of vesting | 100.00% |
Executive Officer | Deferred Share Units (DSUs) |  |
Share based compensation |  |
First increments of share price receivable by executives at the time of vesting | 25.00% |
Second increments of share price receivable by executives at the time of vesting | 50.00% |
Third increments of share price receivable by executives at the time of vesting | 75.00% |
Fourth increments of share price receivable by executives at the time of vesting | 100.00% |

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