XML 101 R66.htm IDEA: XBRL DOCUMENT v3.20.4
Employee Retirement Benefits - Plan Assets, Benefit Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Postretirement Benefits Plan [Member]      
Change in pension benefit obligation:      
Service cost $ 1 $ 1 $ 1
Interest cost 8 9 7
Special termination benefits 0 0 0
Funded status:      
Prepaid (accrued) benefit cost (323) (313)  
Pension Benefits [Member]      
Change in pension plan assets:      
Plan assets, beginning balance 4,800 3,806  
Actual return on plan assets 723 736  
Benefit payments (209) (235)  
Acquisitions 0 493  
Plan assets, ending balance 5,314 4,800 3,806
Change in pension benefit obligation:      
Obligation, beginning balance 3,363 2,522  
Service cost 85 80 70
Interest cost 92 114 82
Acquisitions 0 503  
Special termination benefits 16 19 35
Plan amendments 1 3  
Actuarial losses - net(c) 259 357  
Benefit payments (209) (235)  
Obligation, ending balance 3,607 3,363 $ 2,522
Funded status:      
Prepaid (accrued) benefit cost 1,707 1,437  
Accumulated benefit obligation 3,521 3,281  
FPL[Member] | Other Postretirement Benefits Plan [Member]      
Funded status:      
Prepaid (accrued) benefit cost (155) (167)  
FPL[Member] | Pension Benefits [Member]      
Funded status:      
Prepaid (accrued) benefit cost $ 1,554 $ 1,477