Debt - Schedule (Parenthetical) (Details)	Sep. 30, 2023 EUR (€)	Sep. 30, 2023 CAD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 CAD ($)
CAD 500 million 2.84% notes due July 2023(1)
Debt Instrument [Line Items]
Debt instrument, face amount				$ 500,000,000
Debt Instrument, interest rate				2.84%
EUR 800 million 1.25% notes due July 2024
Debt Instrument [Line Items]
Debt instrument, face amount | €	€ 800,000,000
Debt Instrument, interest rate	1.25%	1.25%	1.25%
CAD 500 million 3.44% notes due July 2026
Debt Instrument [Line Items]
Debt instrument, face amount		$ 500,000,000
Debt Instrument, interest rate	3.44%	3.44%	3.44%
$2.0 billion 3.0% notes due July 2026
Debt Instrument [Line Items]
Debt instrument, face amount			$ 2,000,000,000.0
Debt Instrument, interest rate	3.00%	3.00%	3.00%
$1.1 billion 5.0% notes due May 2042
Debt Instrument [Line Items]
Debt instrument, face amount			$ 1,100,000,000
Debt Instrument, interest rate	5.00%	5.00%	5.00%
$1.8 billion 4.2% notes due July 2046
Debt Instrument [Line Items]
Debt instrument, face amount			$ 1,800,000,000
Debt Instrument, interest rate	4.20%	4.20%	4.20%