Supplementary Information (Net Change in Non-Cash Working Capital) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Supplemental Cash Flow Elements [Abstract]
Accounts receivable and accrued revenues	$ (169)	$ (58)
Accounts payable and accrued liabilities	(7)	(101)
Current portion of operating lease liabilities	12	20
Income tax receivable and payable	(5)	19
Net change in non-cash working capital	$ (169)	$ (120)

Increase (decrease) in current portion of operating lease liabilities.

No definition available.

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- Definition

The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

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- Definition

Amount of increase (decrease) in receivables, and operating assets classified as other.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

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- Definition

The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes.

+ References

+ Details

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- Definition

Amount of increase (decrease) in current operating assets after deduction of current operating liabilities classified as other.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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