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Debt due within one year - Narrative (Details) - Dec. 31, 2020	USD ($)	CAD ($)
Commercial Paper
Disclosure of detailed information about borrowings [line items]
Maximum borrowing capacity	$ 3,000,000,000	$ 3,000,000,000
Unsecured revolving credit facility and expansion facility
Disclosure of detailed information about borrowings [line items]
Maximum borrowing capacity		$ 3,500,000,000

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- Definition

Line Of Credit Facility, Maximum Borrowing Capacity1

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Balance Type:
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