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RETIREMENT AND POSTRETIREMENT BENEFITS - MEDICAL COST TRENDS (Details) CAD in Millions | 12 Months Ended
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Dec. 31, 2016 CAD
Effect of 1% change in assumed medical care trend rate |
Increase in benefit obligation due to 1% increase in the assumed medical care trend rate | CAD 23
Increase in service and interest cost due to 1% increase in the assumed medical care trend rate | 1
Decrease in benefit obligation due to 1% decrease in the assumed medical care trend rate | 45
Decrease in service and interest cost due to 1% decrease in the assumed medical care trend rate | CAD 2
Canadian OPEB Plans | Drugs |
MEDICAL COST TRENDS |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 6.60%
Ultimate Medical Cost Trend Rate Assumption (as a percent) | 4.50%
Year in which Ultimate Medical Cost Trend Rate Assumption is Achieved | 2034
Canadian OPEB Plans | Other medical |
MEDICAL COST TRENDS |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 4.50%
United States OPEB Plan |
MEDICAL COST TRENDS |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 6.90%
Ultimate Medical Cost Trend Rate Assumption (as a percent) | 4.50%
Year in which Ultimate Medical Cost Trend Rate Assumption is Achieved | 2037

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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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