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PENSION AND OTHER POSTRETIREMENT BENEFITS - BENEFIT OBLIGATION, PLAN ASSETS AND FUNDED STATUS (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Canada |  |  |
Change in plan assets |  |  |
Employer contributions | $ 13,000,000 | $ 14,000,000 | $ 0
Canada | Pension |  |  |
Change in projected benefit obligation |  |  |
Benefit obligation at beginning of year | 4,033,000,000 | 2,270,000,000 |
Service cost | 149,000,000 | 156,000,000 | 129,000,000
Interest cost | 130,000,000 | 116,000,000 | 73,000,000
Participant contributions | 25,000,000 | 6,000,000 |
Actuarial (gain)/loss | (146,000,000) | 145,000,000 |
Benefits paid | (184,000,000) | (165,000,000) |
Plan settlements | 0 | 0 |
Transfer out | (10,000,000) | 0 |
Acquired in Merger Transaction | 0 | 1,505,000,000 |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | 0 |
Benefit obligation at beginning of year | 3,997,000,000 | 4,033,000,000 | 2,270,000,000
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,619,000,000 | 2,019,000,000 |
Actual return/(loss) on plan assets | (42,000,000) | 308,000,000 |
Employer contributions | 113,000,000 | 161,000,000 |
Participant contributions | 25,000,000 | 6,000,000 |
Benefits paid | (184,000,000) | (165,000,000) |
Plan settlements | 0 | 0 |
Transfer out | (8,000,000) | 0 |
Acquired in Merger Transaction | 0 | 1,290,000,000 |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | 0 |
Fair value of plan assets at end of year | 3,523,000,000 | 3,619,000,000 | 2,019,000,000
Underfunded status at end of year | (474,000,000) | (414,000,000) |
Presented as follows: |  |  |
Deferred amounts and other assets | 29,000,000 | 38,000,000 |
Accounts payable and other | (9,000,000) | (60,000,000) |
Other long-term liabilities | (494,000,000) | (392,000,000) |
Amount recognized in balance sheet | (474,000,000) | (414,000,000) |
Accumulated benefit obligation | 3,700,000,000 | 3,700,000,000 |
Canada | Supplemental Employee Retirement Plan |  |  |
Presented as follows: |  |  |
Deferred amounts and other assets | 7,000,000 | 9,000,000 |
Canada | OPEB |  |  |
Change in projected benefit obligation |  |  |
Benefit obligation at beginning of year | 321,000,000 | 179,000,000 |
Service cost | 8,000,000 | 7,000,000 | 4,000,000
Interest cost | 10,000,000 | 10,000,000 | 6,000,000
Participant contributions | 0 | 0 |
Actuarial (gain)/loss | (45,000,000) | (8,000,000) |
Benefits paid | (11,000,000) | (10,000,000) |
Plan settlements | 0 | (3,000,000) |
Acquired in Merger Transaction | 0 | 146,000,000 |
Foreign currency exchange rate changes | 0 | 0 |
Other | (1,000,000) | 0 |
Benefit obligation at beginning of year | 282,000,000 | 321,000,000 | 179,000,000
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return/(loss) on plan assets | 0 | 0 |
Employer contributions | 11,000,000 | 10,000,000 |
Participant contributions | 0 | 0 |
Benefits paid | (11,000,000) | (10,000,000) |
Acquired in Merger Transaction | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | 0 |
Fair value of plan assets at end of year | 0 | 0 | 0
Underfunded status at end of year | (282,000,000) | (321,000,000) |
Presented as follows: |  |  |
Deferred amounts and other assets | 0 | 0 |
Accounts payable and other | (12,000,000) | (12,000,000) |
Other long-term liabilities | (270,000,000) | (309,000,000) |
Amount recognized in balance sheet | (282,000,000) | (321,000,000) |
United States |  |  |
Change in plan assets |  |  |
Employer contributions | 27,000,000 | 31,000,000 | 13,000,000
United States | Pension |  |  |
Change in projected benefit obligation |  |  |
Benefit obligation at beginning of year | 1,279,000,000 | 508,000,000 |
Service cost | 45,000,000 | 48,000,000 | 26,000,000
Interest cost | 38,000,000 | 35,000,000 | 16,000,000
Participant contributions | 0 | 0 |
Actuarial (gain)/loss | (103,000,000) | 57,000,000 |
Benefits paid | (60,000,000) | (42,000,000) |
Plan settlements | (65,000,000) | (59,000,000) |
Transfer out | 0 | 0 |
Acquired in Merger Transaction | 0 | 811,000,000 |
Foreign currency exchange rate changes | 105,000,000 | (63,000,000) |
Other | (25,000,000) | (16,000,000) |
Benefit obligation at beginning of year | 1,214,000,000 | 1,279,000,000 | 508,000,000
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 1,097,000,000 | 361,000,000 |
Actual return/(loss) on plan assets | (48,000,000) | 113,000,000 |
Employer contributions | 40,000,000 | 57,000,000 |
Participant contributions | 0 | 0 |
Benefits paid | (60,000,000) | (42,000,000) |
Plan settlements | (65,000,000) | (59,000,000) |
Transfer out | 0 | 0 |
Acquired in Merger Transaction |  | 731,000,000 |
Foreign currency exchange rate changes | (91,000,000) | 51,000,000 |
Other | (10,000,000) | (13,000,000) |
Fair value of plan assets at end of year | 1,045,000,000 | 1,097,000,000 | 361,000,000
Underfunded status at end of year | (169,000,000) | (182,000,000) |
Presented as follows: |  |  |
Deferred amounts and other assets | 0 | 0 |
Accounts payable and other | (4,000,000) | (3,000,000) |
Other long-term liabilities | (165,000,000) | (179,000,000) |
Amount recognized in balance sheet | (169,000,000) | (182,000,000) |
Accumulated benefit obligation | 1,200,000,000 | 1,200,000,000 |
United States | Supplemental Employee Retirement Plan |  |  |
Presented as follows: |  |  |
Deferred amounts and other assets | 39,000,000 | 40,000,000 |
United States | OPEB |  |  |
Change in projected benefit obligation |  |  |
Benefit obligation at beginning of year | 337,000,000 | 133,000,000 |
Service cost | 3,000,000 | 5,000,000 | 4,000,000
Interest cost | 10,000,000 | 10,000,000 | 5,000,000
Participant contributions | 6,000,000 | 4,000,000 |
Actuarial (gain)/loss | (25,000,000) | (34,000,000) |
Benefits paid | (29,000,000) | (19,000,000) |
Plan settlements | (8,000,000) | 1,000,000 |
Acquired in Merger Transaction | 0 | 254,000,000 |
Foreign currency exchange rate changes | 27,000,000 | (17,000,000) |
Other | (16,000,000) | 0 |
Benefit obligation at beginning of year | 305,000,000 | 337,000,000 | 133,000,000
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 213,000,000 | 115,000,000 |
Actual return/(loss) on plan assets | (13,000,000) | 21,000,000 |
Employer contributions | 8,000,000 | 1,000,000 |
Participant contributions | 6,000,000 | 4,000,000 |
Benefits paid | (29,000,000) | (19,000,000) |
Acquired in Merger Transaction | 0 | 102,000,000 |
Foreign currency exchange rate changes | 16,000,000 | (11,000,000) |
Other | (20,000,000) | 0 |
Fair value of plan assets at end of year | 181,000,000 | 213,000,000 | $ 115,000,000
Underfunded status at end of year | (124,000,000) | (124,000,000) |
Presented as follows: |  |  |
Deferred amounts and other assets | 2,000,000 | 7,000,000 |
Accounts payable and other | (7,000,000) | (7,000,000) |
Other long-term liabilities | (119,000,000) | (124,000,000) |
Amount recognized in balance sheet | $ (124,000,000) | $ (124,000,000) |

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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increases plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(8) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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