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Changes in Accumulated other comprehensive income ("AOCL") by component (Tables)
 9 Months Ended
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss) by Component
For the three months ended September 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, July 1, 2023$857 $2 $(1,406)$3 $(544)
Other comprehensive income before reclassifications603 — — — 603 
Amounts reclassified from accumulated other comprehensive income— 1 6 — 7 
Net other comprehensive income603 1 6 — 610 
Closing balance, September 30, 2023$1,460 $3 $(1,400)$3 $66 
Opening balance, July 1, 2022$217 $(2)$(1,856)$102 $(1,539)
Other comprehensive income (loss) before reclassifications1,618 — (14)37 1,641 
Amounts reclassified from accumulated other comprehensive income— 1 30 — 31 
Net other comprehensive income1,618 1 16 37 1,672 
Closing balance, September 30, 2022$1,835 $(1)$(1,840)$139 $133 
(1)Amounts are presented net of tax.
(2)Amounts presented are those attributable to common shareholders.

For the nine months ended September 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(45)— (9)6 (48)
Amounts reclassified from accumulated other comprehensive income— 3 19 1 23 
Net other comprehensive (loss) income(45)3 10 7 (25)
Closing balance, September 30, 2023$1,460 $3 $(1,400)$3 $66 
Opening balance, January 1, 2022$(182)$(4)$(1,915)$(2)$(2,103)
Other comprehensive income (loss) before reclassifications2,017 — (14)140 2,143 
Amounts reclassified from accumulated other comprehensive income— 3 89 1 93 
Net other comprehensive income2,017 3 75 141 2,236 
Closing balance, September 30, 2022$1,835 $(1)$(1,840)$139 $133 
(1)Amounts are presented net of tax.
(2)Amounts presented are those attributable to common shareholders.