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PENSION AND OTHER POSTRETIREMENT BENEFITS - BENEFIT OBLIGATION, PLAN ASSETS AND FUNDED STATUS (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Canada |  |  |
Change in plan assets |  |  |
Employer contributions | $ 0 | $ 4 | $ 13
Canada | Pension |  |  |
Change in projected benefit obligation |  |  |
Accumulated postretirement benefit obligation at beginning of year | 4,446 | 3,997 |
Service cost | 148 | 149 | 149
Interest cost | 128 | 139 | 130
Participant contributions | 31 | 32 |
Actuarial loss | 292 | 423 |
Benefits paid | (190) | (187) |
Plan settlements | 0 | (99) |
Transfers out | 0 | (8) |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | 0 |
Accumulated postretirement benefit obligation at end of year | 4,855 | 4,446 | 3,997
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 3,827 | 3,523 |
Actual return on plan assets | 288 | 448 |
Employer contributions | 121 | 114 |
Participant contributions | 31 | 32 |
Benefits paid | (190) | (187) |
Plan settlements | 0 | (99) |
Transfers out | 0 | (4) |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | 0 |
Fair value of plan assets at end of year | 4,077 | 3,827 | 3,523
Underfunded status at end of year | (778) | (619) |
Presented as follows: |  |  |
Deferred amounts and other assets | 35 | 35 |
Accounts payable and other | (9) | (9) |
Other long-term liabilities | (804) | (645) |
Amount recognized in balance sheet | (778) | (619) |
Accumulated benefit obligation | 4,500 | 4,000 |
Canada | Supplemental Employee Retirement Plan |  |  |
Presented as follows: |  |  |
Deferred amounts and other assets | 11 | 10 |
Canada | OPEB |  |  |
Change in projected benefit obligation |  |  |
Accumulated postretirement benefit obligation at beginning of year | 293 | 282 |
Service cost | 5 | 5 | 8
Interest cost | 8 | 10 | 10
Participant contributions | 0 | 0 |
Actuarial loss | 21 | 15 |
Benefits paid | (6) | (6) |
Plan settlements | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Other | 0 | (13) |
Accumulated postretirement benefit obligation at end of year | 321 | 293 | 282
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 6 | 6 |
Participant contributions | 0 | 0 |
Benefits paid | (6) | (6) |
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 | (321) | (293) |
Presented as follows: |  |  |
Deferred amounts and other assets | 0 | 0 |
Accounts payable and other | (13) | (12) |
Other long-term liabilities | (308) | (281) |
Amount recognized in balance sheet | (321) | (293) |
United States |  |  |
Change in plan assets |  |  |
Employer contributions | 27 |  |
United States | Pension |  |  |
Change in projected benefit obligation |  |  |
Accumulated postretirement benefit obligation at beginning of year | 1,230 | 1,214 |
Service cost | 44 | 45 | 45
Interest cost | 31 | 41 | 38
Participant contributions | 0 | 0 |
Actuarial loss | 95 | 106 |
Benefits paid | (128) | (101) |
Plan settlements | 0 | (1) |
Transfers out | 0 | (6) |
Foreign currency exchange rate changes | (23) | (63) |
Other | (6) | (5) |
Accumulated postretirement benefit obligation at end of year | 1,243 | 1,230 | 1,214
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 1,104 | 1,045 |
Actual return on plan assets | 83 | 176 |
Employer contributions | 27 | 46 |
Participant contributions | 0 | 0 |
Benefits paid | (128) | (101) |
Plan settlements | 0 | (1) |
Transfers out | 0 | 0 |
Foreign currency exchange rate changes | (18) | (56) |
Other | (6) | (5) |
Fair value of plan assets at end of year | 1,062 | 1,104 | 1,045
Underfunded status at end of year | (181) | (126) |
Presented as follows: |  |  |
Deferred amounts and other assets | 0 | 0 |
Accounts payable and other | (3) | (4) |
Other long-term liabilities | (178) | (122) |
Amount recognized in balance sheet | (181) | (126) |
Accumulated benefit obligation | 1,200 |  |
United States | Supplemental Employee Retirement Plan |  |  |
Presented as follows: |  |  |
Deferred amounts and other assets | 59 | 51 |
United States | OPEB |  |  |
Change in projected benefit obligation |  |  |
Accumulated postretirement benefit obligation at beginning of year | 288 | 305 |
Service cost | 2 | 2 | 3
Interest cost | 7 | 10 | 10
Participant contributions | 4 | 5 |
Actuarial loss | 17 | 7 |
Benefits paid | (28) | (28) |
Plan settlements | (33) | 0 |
Foreign currency exchange rate changes | (4) | (15) |
Other | 1 | 2 |
Accumulated postretirement benefit obligation at end of year | 254 | 288 | 305
Change in plan assets |  |  |
Fair value of plan assets at beginning of year | 188 | 181 |
Actual return on plan assets | 14 | 27 |
Employer contributions | 12 | 10 |
Participant contributions | 4 | 5 |
Benefits paid | (28) | (28) |
Foreign currency exchange rate changes | (3) | (9) |
Other | 1 | 2 |
Fair value of plan assets at end of year | 188 | 188 | $ 181
Underfunded status at end of year | (66) | (100) |
Presented as follows: |  |  |
Deferred amounts and other assets | 19 | 0 |
Accounts payable and other | (6) | (8) |
Other long-term liabilities | (79) | (92) |
Amount recognized in balance sheet | $ (66) | $ (100) |

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