Debt - Proceeds From Issuance of Long-Term Debt (Details)				3 Months Ended
	Dec. 02, 2021 CAD ($)	Dec. 02, 2021 USD ($)	Nov. 24, 2021 CAD ($)	Dec. 31, 2022 CAD ($)	Dec. 02, 2021 USD ($)
Debt Instrument [Line Items]
Net proceeds	$ 8,600,000,000	$ 6,700,000,000	$ 2,200,000,000	$ 10,700,000,000
1.589% 2-year Notes
Debt Instrument [Line Items]
Debt face amount			$ 1,000,000,000.0
Interest rate			1.589%	1.589%
Net proceeds			$ 1,000,000,000.00
2.540% 6.3-year Notes
Debt Instrument [Line Items]
Debt face amount			$ 1,200,000,000
Interest rate			2.54%	2.54%
Net proceeds			$ 1,200,000,000
1.350% 3-year Notes
Debt Instrument [Line Items]
Debt face amount					$ 1,500,000,000
Interest rate	1.35%			1.35%	1.35%
Net proceeds	$ 1,910,000,000	1,490,000,000
1.750% 5-year Notes
Debt Instrument [Line Items]
Debt face amount					$ 1,000,000,000.0
Interest rate	1.75%			1.75%	1.75%
Net proceeds	$ 1,270,000,000	990,000,000
2.450% 10-year Notes
Debt Instrument [Line Items]
Debt face amount	$ 1,400,000,000				$ 1,400,000,000
Interest rate	2.45%			2.45%	2.45%
Net proceeds	$ 1,780,000,000	1,390,000,000
3.000% 20-year Notes
Debt Instrument [Line Items]
Debt face amount	$ 1,000,000,000				$ 1,000,000,000.0
Interest rate	3.00%			3.00%	3.00%
Net proceeds	$ 1,260,000,000	990,000,000
3.100% 30-year Notes
Debt Instrument [Line Items]
Debt face amount					$ 1,800,000,000
Interest rate	3.10%			3.10%	3.10%
Net proceeds	$ 2,260,000,000	$ 1,770,000,000