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Changes in Accumulated other comprehensive (loss) income ("AOCL") by component
 6 Months Ended
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in Accumulated other comprehensive (loss) income ("AOCL") by component Changes in Accumulated other comprehensive (loss) income ("AOCL") by component
For the three months ended June 30
(in millions of Canadian dollars)
Foreign currency net of hedging activities(1)(2)
Derivatives(1)(2)
Pension and post-
retirement defined
benefit plans(1)(2)
Equity accounted investments(1)(2)
Total(1)(2)
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 accumulated other comprehensive income— 1 7 1 9 
Net other comprehensive (loss) income(621)1 (2)4 (618)
Closing balance, June 30, 2023$857 $2 $(1,406)$3 $(544)
Opening balance, April 1, 2022$(531)$(3)$(1,884)$45 $(2,373)
Other comprehensive income before reclassifications748 — — 57 805 
Amounts reclassified from accumulated other comprehensive loss— 1 28 — 29 
Net other comprehensive income748 1 28 57 834 
Closing balance, June 30, 2022$217 $(2)$(1,856)$102 $(1,539)
(1)Amounts are presented net of tax.
(2)Amounts presented are those attributable to common shareholders.
For the six months ended June 30
(in millions of Canadian dollars)
Foreign currency net of hedging activities(1)(2)
Derivatives(1)(2)
Pension and post-
retirement defined
benefit plans(1)(2)
Equity accounted investments(1)(2)
Total(1)(2)
Opening balance, January 1, 2023$1,505 $— $(1,410)$(4)$91 
Other comprehensive (loss) income before reclassifications(648)— (9)6 (651)
Amounts reclassified from accumulated other comprehensive income (loss)— 2 13 1 16 
Net other comprehensive (loss) income(648)2 4 7 (635)
Closing balance, June 30, 2023$857 $2 $(1,406)$3 $(544)
Opening balance, January 1, 2022$(182)$(4)$(1,915)$(2)$(2,103)
Other comprehensive income before reclassifications399 — — 103 502 
Amounts reclassified from accumulated other comprehensive loss— 2 59 1 62 
Net other comprehensive income399 2 59 104 564 
Closing balance, June 30, 2022$217 $(2)$(1,856)$102 $(1,539)