The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in equity resulting from treasury share transactions. [Refer: Equity; Treasury shares]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Common Stock Shares Authorized For Repurchase

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Disclosure of dividends.

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Number of instruments outstanding in a share based payment arrangement.

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Percentage of the Company's issued and outstanding common shares.

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Share purchased and cancelled value.

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Stock Purchased And Cancelled, Value, Tax Incurred

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Stock Repurchased And Retired During Period, Shares 1

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Equity Capital and Earnings Per share - Additional Information (Detail) - CAD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Feb. 19, 2025	May 07, 2024	Feb. 20, 2024	Dec. 31, 2024	Dec. 31, 2023
NCIB
Disclosure of Dividends [line items]
Stock repurchased and retired during period shares				82,800,000	62,600,000
Total cost of shares				$ 3,212	$ 1,595
Tax incurred on repurchases shares				$ 60
Options and Deferred Share Units
Disclosure of Dividends [line items]
Number of instruments outstanding in a share based payment arrangement				12,000,000	17,000,000
Common shares \| Major ordinary share transactions
Disclosure of Dividends [line items]
Dividend declared but not paid	$ 0.44
NCIB 2024
Disclosure of Dividends [line items]
Common stock shares authorized for repurchase			50,000,000
NCIB 2024 \| Top of range
Disclosure of Dividends [line items]
Common stock shares authorized for repurchase		90,000,000
NCIB 2024 \| Major ordinary share transactions
Disclosure of Dividends [line items]
Percentage of the companys issued and outstanding common shares			2.80%
NCIB 2024 \| Major ordinary share transactions \| Top of range
Disclosure of Dividends [line items]
Percentage of the companys issued and outstanding common shares		5.00%
NCIB 2023 and NCIB 2024 \| Issued capital
Disclosure of Dividends [line items]
Increase decrease through treasury share transactions				$ 990	$ 745
NCIB 2023 and NCIB 2024 \| Retained earnings
Disclosure of Dividends [line items]
Increase decrease through treasury share transactions				$ 2,282	$ 850
NCIB 2022 \| NCIB
Disclosure of Dividends [line items]
Stock repurchased and retired during period shares					6,900,000
Total cost of shares					$ 175
NCIB 2025
Disclosure of Dividends [line items]
Common stock shares authorized for repurchase	51,500,000
NCIB 2025 \| Major ordinary share transactions
Disclosure of Dividends [line items]
Percentage of the companys issued and outstanding common shares	3.00%