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Employee Retirement Benefits - Plan Assets, Benefit Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Postretirement Benefits Plan [Member]      
Change in pension benefit obligation:      
Service cost $ 2 $ 1 $ 1
Interest cost 4 8 9
Special termination benefits 0 0 0
Funded status:      
Prepaid (accrued) benefit cost (300) (323)  
Pension Benefits [Member]      
Change in pension plan assets:      
Plan assets, beginning balance 5,314 4,800  
Actual return on plan assets 627 723  
Benefit payments (253) (209)  
Plan assets, ending balance 5,688 5,314 4,800
Change in pension benefit obligation:      
Obligation, beginning balance 3,607 3,363  
Service cost 90 85 80
Interest cost 64 92 114
Special termination benefits 0 16 19
Plan amendments 0 1  
Actuarial losses (gains) – net (63) 259  
Benefit payments (253) (209)  
Obligation, ending balance 3,445 3,607 $ 3,363
Funded status:      
Prepaid (accrued) benefit cost 2,243 1,707  
Accumulated benefit obligation 3,352 3,521  
FPL [Member] | Other Postretirement Benefits Plan [Member]      
Funded status:      
Prepaid (accrued) benefit cost (139) (156)  
FPL [Member] | Pension Benefits [Member]      
Funded status:      
Prepaid (accrued) benefit cost $ 1,657 $ 1,550