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Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Derivative assets $ 2,453 $ 3,520
Derivative Asset, Current 875 1,730
Derivative Asset, Noncurrent $ 1,578 $ 1,790
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Other assets, current Other assets, current
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Other
Derivative liability $ 3,526 $ 3,586
Derivative Liability, Current 1,122 845
Derivative Liability, Noncurrent $ 2,404 $ 2,741
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current Other Liabilities, Current
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Current Derivative Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Offset Against Collateral $ 112 $ 148
Non Current Derivative Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Offset Against Collateral 187 307
Current derivative liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 209 815
Commodity contracts | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 2,331 3,135
Derivative liability 2,253 2,903
Derivative asset, netting (4,350) (6,171)
Derivative liability, netting 4,260 6,531
Commodity contracts | Level 1 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 1,897 2,640
Derivative Liability, Gross Liability 2,405 3,796
Commodity contracts | Level 2 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 3,154 4,741
Derivative Liability, Gross Liability 3,291 4,664
Commodity contracts | Level 3 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 1,630 1,925
Derivative Liability, Gross Liability 817 974
Interest rate contracts | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 117 385
Derivative liability 1,224 634
Derivative asset, netting (33) 81
Derivative liability, netting 33 81
Interest rate contracts | Level 1 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 0 0
Derivative Liability, Gross Liability 0 0
Interest rate contracts | Level 2 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 150 304
Derivative Liability, Gross Liability 1,257 553
Interest rate contracts | Level 3 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 0 0
Derivative Liability, Gross Liability 0 0
Foreign currency contracts | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 5 0
Derivative liability 49 49
Derivative asset, netting (2) 0
Derivative liability, netting 2 0
Foreign currency contracts | Level 1 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 0 0
Derivative Liability, Gross Liability 0 0
Foreign currency contracts | Level 2 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 7 0
Derivative Liability, Gross Liability 51 49
Foreign currency contracts | Level 3 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 0 0
Derivative Liability, Gross Liability 0 0
Florida Power & Light Company    
Derivatives, Fair Value [Line Items]    
Derivative assets 32 27
Derivative Asset, Current 17 13
Derivative Asset, Noncurrent 15 14
Derivative liability 6 15
Derivative Liability, Current 4 9
Derivative Liability, Noncurrent 2 6
Florida Power & Light Company | Commodity contracts | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 32 27
Derivative liability 6 15
Derivative asset, netting (11) (3)
Derivative liability, netting 8 3
Florida Power & Light Company | Commodity contracts | Level 1 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 0 0
Derivative Liability, Gross Liability 0 0
Florida Power & Light Company | Commodity contracts | Level 2 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 1 1
Derivative Liability, Gross Liability 5 13
Florida Power & Light Company | Commodity contracts | Level 3 | Fair value measurements made on a recurring basis [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Gross Asset 42 29
Derivative Liability, Gross Liability $ 9 $ 5