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Changes in Accumulated other comprehensive income ("AOCI") by component
 6 Months Ended
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in Accumulated other comprehensive income ("AOCI") by component Changes in Accumulated other comprehensive income ("AOCI") by component
Changes in AOCI attributable to controlling shareholders, net of tax, by component are as follows:

For the three months ended June 30
(in millions of Canadian dollars)Foreign currency net of hedging activitiesDerivativesPension and post-
retirement defined
benefit plans		Equity accounted investmentsTotal
Opening balance, April 1, 2024$1,522 $6 $(1,454)$3 $77 
Other comprehensive income (loss) before reclassifications294 — — (2)292 
Amounts reclassified from AOCI— 2 8 — 10 
Net other comprehensive income (loss)294 2 8 (2)302 
Closing balance, June 30, 2024$1,816 $8 $(1,446)$1 $379 
Opening balance, April 1, 2023$1,478 $1 $(1,404)$(1)$74 
Other comprehensive (loss) income before reclassifications(621)— (9)3 (627)
Amounts reclassified from AOCI— 1 7 1 9 
Net other comprehensive (loss) income(621)1 (2)4 (618)
Closing balance, June 30, 2023$857 $2 $(1,406)$3 $(544)

For the six months ended June 30
(in millions of Canadian dollars)Foreign currency net of hedging activitiesDerivativesPension and post-
retirement defined
benefit plans		Equity accounted investmentsTotal
Opening balance, January 1, 2024$837 $5 $(1,463)$3 $(618)
Other comprehensive income (loss) before reclassifications979 — — (2)977 
Amounts reclassified from AOCI— 3 17 — 20 
Net other comprehensive income (loss)979 3 17 (2)997 
Closing balance, June 30, 2024$1,816 $8 $(1,446)$1 $379 
Opening balance, January 1, 2023$1,505 $— $(1,410)$(4)$91 
Other comprehensive (loss) income before reclassifications(648)— (9)6 (651)
Amounts reclassified from AOCI— 2 13 1 16 
Net other comprehensive (loss) income(648)2 4 7 (635)
Closing balance, June 30, 2023$857 $2 $(1,406)$3 $(544)