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Commitments and Contingencies (Summary of Contractual Commitments) (Details) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($)
Recorded Unconditional Purchase Obligation [Line Items] |  |  |
2025 | $ 2,404 |  |
2026 | 1,298 |  |
2027 | 1,037 |  |
2028 | 886 |  |
2029 | 840 |  |
Thereafter | 7,979 |  |
Contractual Commitments | 14,444 |  |
Other commitments |  |  |
Commitment | 1,880 |  | $ 1,772
Revenue, Remaining Performance Obligation, Amount | $ 495 |  | $ 488
Nalcor Energy |  |  |
Other commitments |  |  |
Long-term Purchase Commitment, Period | 50 years |  |
TEC |  |  |
Other commitments |  |  |
Approved payment | $ 17 | $ 12 |
SeaCoast Gas Transmission, LLC | PGS |  |  |
Other commitments |  |  |
Revenue, Remaining Performance Obligation, Amount | $ 135 |  |
Maritime Link Project |  |  |
Other commitments |  |  |
Long-term Purchase Commitment, Period | 38 years |  |
Approved payment | $ 197 |  |
Purchased power |  |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |  |
2025 | 307 |  |
2026 | 277 |  |
2027 | 368 |  |
2028 | 368 |  |
2029 | 369 |  |
Thereafter | 4,487 |  |
Contractual Commitments | 6,176 |  |
Transportation |  |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |  |
2025 | 742 |  |
2026 | 545 |  |
2027 | 544 |  |
2028 | 454 |  |
2029 | 412 |  |
Thereafter | 3,228 |  |
Contractual Commitments | 5,925 |  |
Transportation | NMGC |  |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |  |
2025 | 30 |  |
2026 | 24 |  |
2027 | 16 |  |
2028 | 12 |  |
2029 | 4 |  |
Contractual Commitments | 86 |  |
Capital projects |  |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |  |
2025 | 604 |  |
2026 | 287 |  |
2027 | 24 |  |
2028 | 0 |  |
2029 | 0 |  |
Thereafter | 0 |  |
Contractual Commitments | 915 |  |
Fuel, gas supply and storage |  |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |  |
2025 | 591 |  |
2026 | 94 |  |
2027 | 21 |  |
2028 | 5 |  |
2029 | 0 |  |
Thereafter | 0 |  |
Contractual Commitments | 711 |  |
Fuel, gas supply and storage | NMGC |  |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |  |
2025 | 109 |  |
2026 | 52 |  |
2027 | 13 |  |
2028 | 3 |  |
Contractual Commitments | 177 |  |
Other |  |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |  |
2025 | 160 |  |
2026 | 95 |  |
2027 | 80 |  |
2028 | 59 |  |
2029 | 59 |  |
Thereafter | 264 |  |
Contractual Commitments | $ 717 |  |

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