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Employee Retirement Benefits - Plan Assets, Benefit Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Postretirement Benefits Plan [Member]      
Change in pension benefit obligation:      
Service cost $ 1 $ 2 $ 1
Interest cost 5 4 8
Special termination benefits 0 0 0
Funded status:      
Prepaid (accrued) benefit cost (237) (300)  
Pension Benefits [Member]      
Change in pension plan assets:      
Plan assets, beginning balance 5,688 5,314  
Actual return on plan assets (820) 627  
Benefit payments (325) (253)  
Plan assets, ending balance 4,543 5,688 5,314
Change in pension benefit obligation:      
Obligation, beginning balance 3,445 3,607  
Service cost 86 90 85
Interest cost 77 64 92
Special termination benefits (52) 0 (16)
Plan amendments (3) 0  
Actuarial gains – net (627) (63)  
Benefit payments (325) (253)  
Obligation, ending balance 2,711 3,445 $ 3,607
Funded status:      
Prepaid (accrued) benefit cost 1,832 2,243  
Accumulated benefit obligation 2,650 3,352  
FPL [Member] | Other Postretirement Benefits Plan [Member]      
Funded status:      
Prepaid (accrued) benefit cost (115) (139)  
FPL [Member] | Pension Benefits [Member]      
Funded status:      
Prepaid (accrued) benefit cost $ 1,732 $ 1,657