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Employee Future Benefits
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Employee Future Benefits EMPLOYEE FUTURE BENEFITS
The Corporation and its subsidiaries each maintain one or a combination of defined benefit pension plans and defined contribution pension plans, including group Registered Retirement Savings Plans and group 401(k) plans, for employees. The Corporation and certain subsidiaries also offer other post-employment benefit ("OPEB") plans for qualifying employees. The net benefit cost is detailed below.
Defined Benefit
Pension Plans
OPEB Plans
($ millions)2020  2019  2020  2019  
Quarter Ended June 30
Components of net benefit cost
Service costs25  19    
Interest costs29  32    
Expected return on plan assets(44) (40) (5) (4) 
Amortization of actuarial losses (gains)  (2) (1) 
Amortization of past service credits/plan amendments(1) (1) —  (2) 
Regulatory adjustments(1) —    
Net benefit cost17  16    
Year-to-Date June 30
Components of net benefit cost
Service costs50  38  16  14  
Interest costs57  63  11  13  
Expected return on plan assets(88) (80) (10) (8) 
Amortization of actuarial losses (gains)17  12  (3) (2) 
Amortization of past service credits/plan amendments
(1) (1) (1) (4) 
Regulatory adjustments(2)    
Net benefit cost33  33  15  16  
Defined contribution pension plan expense for the three and six months ended June 30, 2020 was $9 million and $22 million, respectively (three and six months ended June 30, 2019 - $10 million and $22 million, respectively).