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Employee Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Net periodic benefit (income) cost
The components of net periodic cost (income) for the plans are as follows:
 Pension BenefitsPostretirement Benefits
 Three Months Ended March 31,Three Months Ended March 31,
 2024202320242023
 (millions)
Service cost$18 $16 $— $— 
Interest cost33 33 2 3 
Expected return on plan assets(102)(98)— — 
Special termination benefit(a)
28 — — — 
Net periodic cost (income) at NEE$(23)$(49)$2 $3 
Net periodic cost (income) allocated to FPL$(9)$(32)$2 $2 
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(a) Reflects enhanced early retirement benefit.