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Share-Based Compensation - Share Unit Plans - (Details) shares in Thousands, EquityInstruments in Thousands	12 Months Ended
	Dec. 31, 2018 EquityInstruments shares	Dec. 31, 2017 EquityInstruments shares
Share based compensation
Vesting period	3 years
Performance Share Units (PSUs)
Share based compensation
Vesting period	3 years
Outstanding, beginning of year	2,267	2,413
Granted	1,553	1,570
Redeemed for cash | shares	(1,623)	(1,663)
Forfeited/expired | shares		(53)
Outstanding, end of year	2,197	2,267
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 Stock Units (RSUs)
Share based compensation
Vesting period	3 years
Outstanding, beginning of year	16,072	18,158
Granted	4,796	5,009
Redeemed for cash | shares	(5,962)	(6,354)
Forfeited/expired | shares	(314)	(741)
Outstanding, end of year	14,592	16,072
Deferred Share Units (DSUs)
Share based compensation
Outstanding, beginning of year	1,302	1,218
Granted	192	202
Redeemed for cash | shares	(189)	(118)
Outstanding, end of year	1,305	1,302
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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The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) forfeited and expired in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) redeemed for cash in a share-based payment arrangement.

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The first incremental percentage of share price receivable by the executives at the time of vesting of share units.

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The third incremental percentage of share price receivable by the executives at the time of vesting of share units.

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The second incremental percentage of share price receivable by the executives at the time of vesting of share units.

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