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Debt (Details) $ in Millions, $ in Millions	6 Months Ended
Debt (Details) $ in Millions, $ in Millions	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CAD ($)	Jun. 30, 2026 CAD ($)	Mar. 27, 2026 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 CAD ($)
The Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity (up to)	$ 2,200
3.700% 10.5-year Notes \| Senior Notes
Debt Instrument [Line Items]
Repayment of note	$ 250	$ 339
Interest rate	3.70%		3.70%
Debt term	10 years 6 months	10 years 6 months
3.125% 10-Year Notes \| Senior Notes
Debt Instrument [Line Items]
Repayment of note	$ 250	$ 345
Interest rate	3.125%		3.125%
Debt term	10 years	10 years
4.00% 3-year Note
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt	$ 597	$ 816
4.00% 3-year Note \| Unsecured Debt
Debt Instrument [Line Items]
Interest rate	4.00%		4.00%
Debt term	3 years	3 years
Debt instrument, face amount	$ 600		$ 821
5.50% 30-year Note
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt	$ 589	$ 805
5.50% 30-year Note \| Unsecured Debt
Debt Instrument [Line Items]
Interest rate	5.50%		5.50%
Debt term	30 years	30 years
Debt instrument, face amount	$ 600		$ 821
2-Year Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	2 years	2 years
Line of credit facility, current borrowing capacity	$ 1,100
5-Year Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	5 years	5 years
Line of credit facility, current borrowing capacity	$ 1,100
Commercial Paper \| Commercial Paper Program
Debt Instrument [Line Items]
Maximum borrowing capacity (up to)				$ 2,200	$ 1,500
Commercial Paper \| Unsecured Debt
Debt Instrument [Line Items]
Commercial paper borrowings	$ 1,028		$ 1,461		$ 850	$ 1,165
Weighted average interest rate	2.70%		2.70%		4.02%	4.02%