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Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Employee Benefit Plans [Abstract]
Changes in Benefit Obligation and Plan Assets and Funded Status	For the  Year ended December 31 millions of dollars 2023 2022 Change in Projected Benefit Obligation ("PBO") and Accumulated Post- retirement Benefit Obligation ("APBO") Defined benefit pension plans Non-pension benefit plans Defined benefit pension plans Non-pension benefit plans Balance, January 1 $ 2,158 $ 243 $ 2,624 $ 318 Service cost 30 3 41 4 Plan participant contributions 6 6 6 6 Interest cost 111 13 80 9 Plan amendments - (14) - - Benefits paid  (147) (29) (174) (31) Actuarial losses (gains) 146 10 (480) (79) Settlements and curtailments (8) - (6) - FX translation adjustment (23) (5) 67 16 Balance, December 31 $ 2,273 $ 227 $ 2,158 $ 243 Change in plan assets Balance, January 1 $ 2,163 $ 46 $ 2,702 $ 51 Employer contributions 42 23 45 24 Plan participant contributions  6 6 6 6 Benefits paid (147) (29) (174) (31) Actual return on assets, net of expenses 262 3 (489) (7) Settlements and curtailments (8) - (6) - FX translation adjustment (20) (1) 79 3 Balance, December 31 $ 2,298 $ 48 $ 2,163 $ 46 Funded status, end of year  $ 25 $ (179) $ 5 $ (197)
Plans with PBO/APBO in Excess of Plan Assets and Plans with Accumulated Benefit Obligation ("ABO") in Excess of Plan Assets	millions of dollars 2023 2022 Defined benefit pension plans Non-pension benefit plans Defined benefit pension plans Non-pension benefit plans PBO/APBO $ 120 $ 205 $ 1,006 $ 221 FV of plan assets 37 - 914 - Funded status $ (83) $ (205) $ (92) $ (221) millions of dollars 2023 2022 Defined benefit pension plans Defined benefit pension plans ABO $ 114 $ 111 FV of plan assets 37 33 Funded status $ (77) $ (78)
Amounts Recognized in Consolidated Balance Sheets	As at December 31 December 31 millions of dollars 2023 2022 Defined benefit pension plans Non-pension benefit plans Defined benefit pension plans Non-pension benefit plans Other current liabilities $ (5) $ (18) $ (13) $ (20) Long-term liabilities (78) (187) (80) (201) Other long-term assets 108 26 98 24 AOCI, net of tax and regulatory assets 385 20 358 22 Less: Deferred income tax (expense) recovery in AOCI (8) (1) (7) (1) Net amount recognized $ 402 $ (160) $ 356 $ (176)
Amounts Recognized in AOCI and Regulatory Assets	Regulatory assets Actuarial  (gains) losses Past service (gains) costs millions of dollars Defined Benefit Pension Plans Balance, January 1, 2023 $ 336 $ 15 $ - Amortized in current period (6) (3) - Current year additions 1 41 - Change in FX rate (7) - - Balance, December 31, 2023 $ 324 $ 53 $ - Non-pension benefits plans Balance, January 1, 2023 $ 31 $ (10) $ - Amortized in current period 2 3 - Current year reductions (3) (1) (3) Change in FX rate (1) - 1 Balance, December 31, 2023 $ 29 $ (8) $ (2) As at December 31 December 31 millions of dollars 2023 2022 Defined benefit pension plans Non-pension benefit plans Defined benefit pension plans Non-pension benefit plans Actuarial losses (gains) $ 53 (8) $ 15 $ (10) Past service gains - (2) - - Deferred income tax expense 8 1 7 1 AOCI, net of tax 61 (9) 22 (9) Regulatory assets 324 29 336 31 AOCI, net of tax and regulatory assets $ 385 $ 20 $ 358 $ 22
Net Periodic Benefit Cost	As at Year ended December 31 millions of dollars 2023 2022 Defined benefit pension plans Non-pension benefit plans Defined benefit pension plans Non-pension benefit plans Service cost $ 30 $ 3 $ 41 $ 4 Interest cost 111 13 80 9 Expected return on plan assets (161) (2) (144) - Current year amortization of:  Actuarial losses (gains) 1 (3) 8 -  Regulatory assets (liability) 6 (2) 21 2 Settlement, curtailments 2 - 2 - Total $ (11) $ 9 $ 8 $ 15
Pension Plan Asset Allocations	Canadian Pension Plans Asset Class Target Range at Market Short-term securities 0% to 10% Fixed income 34% to 49% Equities:  Canadian 7% to 17%  Non-Canadian 35% to 59% Non-Canadian Pension Plans Asset Class Target Range at Market Weighted average Cash and cash equivalents 0% to 10% Fixed income 29% to 49% Equities 48% to 68%
Fair Value of Plan Assets	millions of dollars NAV Level 1 Level 2 Total Percentage As at December 31, 2023 Cash and cash equivalents $ - $ 40 $ - $ 40 2 % Net in-transits - (9) - (9) - % Equity securities:  Canadian equity - 96 - 96 4 %  United States equity  - 141 - 141 6 %  Other equity - 112 - 112 5 % Fixed income securities:  Government - - 172 172 8 %  Corporate - - 90 90 4 %  Other - 4 5 9 - % Mutual funds - 50 - 50 2 % Other - 6 (1) 5 - % Open-ended investments measured at NAV  (1) 1,006 - - 1,006 44 % Common collective trusts measured at NAV (2) 586 - - 586 25 % Total  $ 1,592 $ 440 $ 266 $ 2,298 100 % As at December 31, 2022 Cash and cash equivalents $ - $ 70 $ - $ 70 3 % Net in-transits - (70) - (70) (3) % Equity securities:  Canadian equity - 87 - 87 4 %  United States equity  - 233 - 233 11 %  Other equity - 186 - 186 8 % Fixed income securities:  Government - - 104 104 5 %  Corporate - - 83 83 4 %  Other - 3 11 14 1 % Mutual funds - 68 - 68 3 % Other - - (3) (3) - % Open-ended investments measured at NAV  (1) 790 - - 790 36 % Common collective trusts measured at NAV (2) 601 - - 601 28 % Total  $ 1,391 $ 577 $ 195 $ 2,163 100 % (1) Net asset value ("NAV") investments are open-ended registered and non-registered mutual funds, collective investment trusts, or pooled funds. NAV’s are calculated at least monthly and the funds honour subscription and redemption activity regularly. (2) The common collective trusts are private funds valued at NAV. The NAVs are calculated based on bid prices of the underlying securities. Since the prices are not published to external sources, NAV is used as a practical expedient. Certain funds invest primarily in equity securities of domestic and foreign issuers while others invest in long duration U.S. investment grade fixed income assets and seeks to increase return through active management of interest rate and credit risks. The funds honour subscription and redemption activity regularly.
Expected Cash Flows for Defined Benefit Pension and Other Post-Retirement Benefit Plans	millions of dollars Defined benefit pension plans Non-pension benefit plans Expected employer contributions 2024 $ 34 $ 19 Expected benefit payments 2024 172 21 2025 163 21 2026 166 21 2027 171 21 2028 173 20 2029 – 2033 890 95
Assumptions Used in Accounting for Defined Benefit Pension and Other Post-Retirement Benefit Plans	Assumptions: The following table shows the assumptions that have been used in accounting for DB pension and other post-retirement benefit plans: 2023 2022 (weighted average assumptions) Defined benefit pension plans Non-pension benefit plans Defined benefit pension plans Non-pension benefit plans Benefit obligation – December 31: Discount rate - past service 4.89 % 4.89 % 5.33 % 5.31 % Discount rate - future service 4.88 % 4.89 % 5.34 % 5.32 % Rate of compensation increase 3.87 % 3.85 % 3.62 % 3.61 % Health care trend - initial (next year) - 6.04 % - 5.40 %  - ultimate  - 3.76 % - 3.77 %  - year ultimate reached 2043 2043 Benefit cost for year ended December 31: Discount rate - past service 5.33 % 5.31 % 3.05 % 2.81 % Discount rate - future service 5.34 % 5.32 % 3.18 % 2.92 % Expected long-term return on plan assets 6.56 % 2.16 % 6.07 % 1.32 % Rate of compensation increase 3.62 % 3.61 % 3.31 % 3.29 % Health care trend - initial (current year) - 5.40 % - 5.09 %  - ultimate  - 3.77 % - 3.77 %  - year ultimate reached 2043 2042 Actual assumptions used differ by plan.

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Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans.

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Tabular disclosure of benefit obligation and plan assets of defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.

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Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized.

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Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.

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Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate.

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Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

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Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

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