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PENSION AND OTHER POSTRETIREMENT BENEFITS - PLAN ASSETS (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Canada | Equity securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 43.40% |
Plan asset allocations | 46.40% | 45.80%
Canada | Fixed income securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 30.30% |
Plan asset allocations | 31.00% | 38.80%
Canada | Alternatives |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 26.30% |
Plan asset allocations | 22.60% | 15.40%
Canada | Pension |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 3,523 | $ 3,619
Fair value of plan assets at end of year | 3,827 | 3,523
Canada | Pension | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 596 |
Fair value of plan assets at end of year | 545 | 596
Canada | Pension | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 2,365 |
Fair value of plan assets at end of year | 2,430 | 2,365
Canada | Pension | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 562 | 340
Unrealized and realized gains | 10 | 77
Purchases and settlements, net | 280 | 145
Fair value of plan assets at end of year | 852 | 562
Canada | Pension | Cash and Cash Equivalents |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 240 |
Fair value of plan assets at end of year | 184 | 240
Canada | Pension | Cash and Cash Equivalents | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 240 |
Fair value of plan assets at end of year | 184 | 240
Canada | Pension | Cash and Cash Equivalents | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Cash and Cash Equivalents | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, Non-US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 619 |
Fair value of plan assets at end of year | 348 | 619
Canada | Pension | Equity Securities, Non-US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 138 |
Fair value of plan assets at end of year | 165 | 138
Canada | Pension | Equity Securities, Non-US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 481 |
Fair value of plan assets at end of year | 183 | 481
Canada | Pension | Equity Securities, Non-US | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, US | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 992 |
Fair value of plan assets at end of year | 1,429 | 992
Canada | Pension | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 992 |
Fair value of plan assets at end of year | 1,429 | 992
Canada | Pension | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Government |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 671 |
Fair value of plan assets at end of year | 614 | 671
Canada | Pension | Government | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 218 |
Fair value of plan assets at end of year | 196 | 218
Canada | Pension | Government | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 453 |
Fair value of plan assets at end of year | 418 | 453
Canada | Pension | Government | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Corporate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 457 |
Fair value of plan assets at end of year | 388 | 457
Canada | Pension | Corporate | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Corporate | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 457 |
Fair value of plan assets at end of year | 388 | 457
Canada | Pension | Corporate | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Infrastructure and real estate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 562 |
Fair value of plan assets at end of year | 852 | 562
Canada | Pension | Infrastructure and real estate | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Infrastructure and real estate | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Infrastructure and real estate | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 562 |
Fair value of plan assets at end of year | 852 | 562
Canada | Pension | Forward currency contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | (18) |
Fair value of plan assets at end of year | 12 | (18)
Canada | Pension | Forward currency contracts | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | Pension | Forward currency contracts | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | (18) |
Fair value of plan assets at end of year | 12 | (18)
Canada | Pension | Forward currency contracts | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 | 0
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 | 0
Unrealized and realized gains | 0 | 0
Purchases and settlements, net | 0 | 0
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Cash and Cash Equivalents | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Cash and Cash Equivalents | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Cash and Cash Equivalents | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Cash and Cash Equivalents | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Equity Securities, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Equity Securities, US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Equity Securities, US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Equity Securities, US | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Government | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Government | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Government | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Government | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Corporate | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
Canada | OPEB | Corporate | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
Canada | OPEB | Corporate | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
Canada | OPEB | Corporate | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
Canada | OPEB | Infrastructure and real estate | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Infrastructure and real estate | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Infrastructure and real estate | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Canada | OPEB | Infrastructure and real estate | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | $ 0 | $ 0
United States | Equity securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 45.00% |
Plan asset allocations | 55.20% | 52.70%
United States | Fixed income securities |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 20.00% |
Plan asset allocations | 19.80% | 34.90%
United States | Alternatives |  |
Pension and Other Postretirement Benefit Disclosures |  |
Allocation of plan assets (as a percent) | 35.00% |
Plan asset allocations | 25.00% | 12.40%
United States | Pension |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | $ 1,045 | $ 1,097
Fair value of plan assets at end of year | 1,104 | 1,045
United States | Pension | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 56 |
Fair value of plan assets at end of year | 14 | 56
United States | Pension | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 859 |
Fair value of plan assets at end of year | 814 | 859
United States | Pension | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 130 | 56
Unrealized and realized gains | 13 | 9
Purchases and settlements, net | 133 | 65
Fair value of plan assets at end of year | 276 | 130
United States | Pension | Cash and Cash Equivalents |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 56 |
Fair value of plan assets at end of year | 14 | 56
United States | Pension | Cash and Cash Equivalents | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 56 |
Fair value of plan assets at end of year | 14 | 56
United States | Pension | Cash and Cash Equivalents | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Cash and Cash Equivalents | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Equity Securities, Non-US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Equity Securities, Non-US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Equity Securities, Non-US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Equity Securities, Non-US | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Equity Securities, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 110 |
Fair value of plan assets at end of year | 93 | 110
United States | Pension | Equity Securities, US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Equity Securities, US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 110 |
Fair value of plan assets at end of year | 93 | 110
United States | Pension | Equity Securities, US | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 440 |
Fair value of plan assets at end of year | 516 | 440
United States | Pension | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 440 |
Fair value of plan assets at end of year | 516 | 440
United States | Pension | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Government |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 265 |
Fair value of plan assets at end of year | 164 | 265
United States | Pension | Government | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Government | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 265 |
Fair value of plan assets at end of year | 164 | 265
United States | Pension | Government | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Corporate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 44 |
Fair value of plan assets at end of year | 41 | 44
United States | Pension | Corporate | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Corporate | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 44 |
Fair value of plan assets at end of year | 41 | 44
United States | Pension | Corporate | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Infrastructure and real estate |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 130 |
Fair value of plan assets at end of year | 276 | 130
United States | Pension | Infrastructure and real estate | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Infrastructure and real estate | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Infrastructure and real estate | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 130 |
Fair value of plan assets at end of year | 276 | 130
United States | Pension | Forward currency contracts |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Forward currency contracts | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Forward currency contracts | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | Pension | Forward currency contracts | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 181 | 213
Fair value of plan assets at end of year | 188 | 181
United States | OPEB | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 181 |
Fair value of plan assets at end of year | 188 | 181
United States | OPEB | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 50 |
Fair value of plan assets at end of year | 42 | 50
United States | OPEB | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 126 |
Fair value of plan assets at end of year | 128 | 126
United States | OPEB | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 5 | 0
Unrealized and realized gains | 1 | 0
Purchases and settlements, net | 12 | 5
Fair value of plan assets at end of year | 18 | 5
United States | OPEB | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 5 |
Fair value of plan assets at end of year | 18 | 5
United States | OPEB | Cash and Cash Equivalents | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 7 |
Fair value of plan assets at end of year | 2 | 7
United States | OPEB | Cash and Cash Equivalents | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 7 |
Fair value of plan assets at end of year | 2 | 7
United States | OPEB | Cash and Cash Equivalents | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Cash and Cash Equivalents | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Equity Securities, US |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 68 |
Fair value of plan assets at end of year | 75 | 68
United States | OPEB | Equity Securities, US | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Equity Securities, US | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 68 |
Fair value of plan assets at end of year | 75 | 68
United States | OPEB | Equity Securities, US | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Equity Securities, Global |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 30 |
Fair value of plan assets at end of year | 38 | 30
United States | OPEB | Equity Securities, Global | Level 1 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Equity Securities, Global | Level 2 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 30 |
Fair value of plan assets at end of year | 38 | 30
United States | OPEB | Equity Securities, Global | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Government | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 71 |
Fair value of plan assets at end of year | 55 | 71
United States | OPEB | Government | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 43 |
Fair value of plan assets at end of year | 40 | 43
United States | OPEB | Government | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 28 |
Fair value of plan assets at end of year | 15 | 28
United States | OPEB | Government | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Corporate | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
United States | OPEB | Corporate | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
United States | OPEB | Corporate | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
United States | OPEB | Corporate | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
United States | OPEB | Infrastructure and real estate | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 5 |
Fair value of plan assets at end of year | 18 | 5
United States | OPEB | Infrastructure and real estate | Level 1 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Infrastructure and real estate | Level 2 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
United States | OPEB | Infrastructure and real estate | Level 3 | Fair Value |  |
Change in plan assets |  |
Fair value of plan assets at beginning of year | 5 |
Fair value of plan assets at end of year | $ 18 | $ 5

X
- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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 (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=118255775&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=118257860&loc=d3e4179-114921 + Details
Name: | us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
Namespace Prefix: | us-gaap_
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