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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Debt - Credit Facilities (Details) $ in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2024 USD ($) extension	Jun. 30, 2026 USD ($)	Aug. 06, 2026 USD ($)	Jun. 30, 2026 CAD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 CAD ($)	Dec. 31, 2023 USD ($)	Aug. 31, 2022 USD ($)	May 31, 2022 USD ($)	Jan. 31, 2022 USD ($)
Debt Instrument [Line Items]
Letters of credit utilizing availability under our credit facilities		$ 314			$ 319
Remaining borrowing capacity		2,600			1,800
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt		$ 182			425
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Number of available extensions \| extension	2
Extension period	1 year
Facility feature, increase limit	$ 1,000
Basis spread		0.805%
Uncommitted Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 200
Principal		$ 72			0
Long-term debt		72			0
Credit facilities: The Credit Facility
Debt Instrument [Line Items]
Principal		182			425
Long-term debt		182			425
Credit facilities: The Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 3,500
Canadian Sublimit \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		1,000
Long-term debt				$ 257		$ 204
Credit facilities: Commercial Paper Facility
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 1,500	$ 1,000	$ 500
Principal		420			1,000
Long-term debt		$ 420			$ 999
Weighted average interest rate		3.974%		3.974%	4.044%	4.044%
Credit facilities: Commercial Paper Facility \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 2,000