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Equity Capital and Earnings Per Share - Summary of Further Information on Preferred Shares and Other Equity Instruments Outstanding (Detail) - CAD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of classes of share capital [Line Items]
Face amount	$ 395,957	$ 440,098
Other equity interest [member] \| Series 1(LRCN-Series 1) [member]
Disclosure of classes of share capital [Line Items]
Issue date	Feb. 19, 2021
Annual dividend rate	3.375%
Earliest redemption date	May 19, 2026
Face amount	$ 2,000
Net amount	$ 1,982	1,982
Other equity interest [member] \| Series 2 (LRCN-Series 2) [member]
Disclosure of classes of share capital [Line Items]
Issue date	Nov. 12, 2021
Annual dividend rate	4.10%
Earliest redemption date	Feb. 19, 2027
Face amount	$ 1,200
Net amount	$ 1,189	1,189
Other equity interest [member] \| Series 3(LRCN-Series 1) [member]
Disclosure of classes of share capital [Line Items]
Issue date	Jun. 16, 2022
Annual dividend rate	7.117%
Earliest redemption date	Jun. 19, 2027
Face amount	$ 1,000
Net amount	$ 990
Class 1, Series 3 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Mar. 11, 2011
Annual dividend rate	2.348%
Earliest redemption date	Jun. 19, 2026
Number of shares	7
Face amount	$ 163
Net amount	$ 160	160
Class 1, Series 4 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Jun. 20, 2016
Earliest redemption date	Jun. 19, 2026
Number of shares	1
Face amount	$ 37
Net amount	$ 36	36
Class 1, Series 7 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Feb. 22, 2012
Annual dividend rate	4.312%
Earliest redemption date	Mar. 19, 2022
Number of shares	10
Face amount	$ 250
Net amount		244
Class 1, Series 9 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	May 24, 2012
Annual dividend rate	5.978%
Earliest redemption date	Sep. 19, 2027
Number of shares	10
Face amount	$ 250
Net amount	$ 244	244
Class 1, Series 11 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Dec. 04, 2012
Annual dividend rate	4.731%
Earliest redemption date	Mar. 19, 2023
Number of shares	8
Face amount	$ 200
Net amount	$ 196	196
Class 1, Series 13 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Jun. 21, 2013
Annual dividend rate	4.414%
Earliest redemption date	Sep. 19, 2023
Number of shares	8
Face amount	$ 200
Net amount	$ 196	196
Class 1, Series 15 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Feb. 25, 2014
Annual dividend rate	3.786%
Earliest redemption date	Jun. 19, 2024
Number of shares	8
Face amount	$ 200
Net amount	$ 195	195
Class 1, Series 17 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Aug. 15, 2014
Annual dividend rate	3.80%
Earliest redemption date	Dec. 19, 2024
Number of shares	14
Face amount	$ 350
Net amount	$ 343	343
Class 1, Series 19 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Dec. 03, 2014
Annual dividend rate	3.675%
Earliest redemption date	Mar. 19, 2025
Number of shares	10
Face amount	$ 250
Net amount	$ 246	246
Class 1, Series 23 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Nov. 22, 2016
Annual dividend rate	4.85%
Earliest redemption date	Mar. 19, 2022
Number of shares	19
Face amount	$ 475
Net amount		467
Class 1, Series 25 Preferred Shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Feb. 20, 2018
Annual dividend rate	4.70%
Earliest redemption date	Jun. 19, 2023
Number of shares	10
Face amount	$ 250
Net amount	$ 245	245
Class A, Series 2 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Feb. 18, 2005
Annual dividend rate	4.65%
Number of shares	14
Face amount	$ 350
Net amount	$ 344	344
Class A, Series 3 Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Issue date	Jan. 03, 2006
Annual dividend rate	4.50%
Number of shares	12
Face amount	$ 300
Net amount	$ 294	294
Preferred shares [Member]
Disclosure of classes of share capital [Line Items]
Number of shares	131
Face amount	$ 7,475
Net amount	$ 6,660	$ 6,381