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v3.20.1

Employee Benefit Plans (Change in AOCI and Regulatory Assets) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Defined benefit pension plans |  |
Change in AOCI and Regulatory Assets |  |
Beginning Balance | $ 633 |
Amortized in current period | 16 | $ 33
Ending Balance | 517 | 633
Defined benefit pension plans | Regulatory | Assets |  |
Change in AOCI and Regulatory Assets |  |
Beginning Balance | 389 |
Amortized in current period | (20) |
Current year addition to AOCI | 6 |
Foreign currency translation adjustment | (17) |
Ending Balance | 358 | 389
Defined benefit pension plans | Actuarial losses (gains) | Assets |  |
Change in AOCI and Regulatory Assets |  |
Beginning Balance | 246 |
Amortized in current period | (17) |
Current year addition to AOCI | (69) |
Foreign currency translation adjustment | 0 |
Ending Balance | 160 | 246
Defined benefit pension plans | Past service costs (gains) | Assets |  |
Change in AOCI and Regulatory Assets |  |
Beginning Balance | (2) |
Amortized in current period | 1 |
Current year addition to AOCI | 0 |
Foreign currency translation adjustment | 0 |
Ending Balance | (1) | (2)
Non-pension Benefit Plans |  |
Change in AOCI and Regulatory Assets |  |
Beginning Balance | 58 |
Amortized in current period | 0 | (1)
Ending Balance | 73 | 58
Non-pension Benefit Plans | Regulatory | Assets |  |
Change in AOCI and Regulatory Assets |  |
Beginning Balance | 65 |
Amortized in current period | 5 |
Current year addition to AOCI | 11 |
Foreign currency translation adjustment | (3) |
Ending Balance | 78 | 65
Non-pension Benefit Plans | Actuarial losses (gains) | Assets |  |
Change in AOCI and Regulatory Assets |  |
Beginning Balance | (7) |
Amortized in current period | 0 |
Current year addition to AOCI | 2 |
Foreign currency translation adjustment | 0 |
Ending Balance | (5) | (7)
Non-pension Benefit Plans | Past service costs (gains) | Assets |  |
Change in AOCI and Regulatory Assets |  |
Beginning Balance | 0 |
Amortized in current period | 0 |
Current year addition to AOCI | 0 |
Foreign currency translation adjustment | 0 |
Ending Balance | $ 0 | $ 0

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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