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Employee Retirement Benefits
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Employee Retirement Benefits Employee Retirement Benefits
NEE sponsors a qualified noncontributory defined benefit pension plan for substantially all employees of NEE and its subsidiaries and sponsors a contributory postretirement plan for other benefits for retirees of NEE and its subsidiaries meeting certain eligibility requirements.

The components of net periodic income for the plans are as follows:
 Pension BenefitsPostretirement BenefitsPension BenefitsPostretirement Benefits
 Three Months Ended September 30,Three Months Ended September 30,Nine Months Ended September 30,Nine Months Ended September 30,
 20212020202120202021202020212020
 (millions)
Service cost$23 $22 $1 $— $68 $64 $1 $
Interest cost16 23 1 48 69 3 
Expected return on plan assets(85)(80) — (255)(241) — 
Amortization of actuarial loss6 1 — 18 13 4 
Amortization of prior service benefit (1)(4)(4)(1)(1)(11)(12)
Special termination benefits(a)
  —  13  — 
Net periodic income at NEE$(40)$(28)$(1)$(1)$(122)$(83)$(3)$(3)
Net periodic income allocated to FPL$(27)$(21)$(1)$(1)$(81)$(63)$(3)$(3)
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(a) Reflects enhanced early retirement benefit.