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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]    
Special Use Funds Storm Fund Assets $ 69 $ 68
Derivatives:    
Derivative assets 1,813 1,919
Derivatives:    
Derivative liability 1,305 1,191
Restricted cash 369 4,615
Fair value measurements made on a recurring basis [Member]    
Cash equivalents:    
Equity securities 805 486
Special use funds:    
Equity securities 3,430 3,046
U.S. Government and municipal bonds 599 604
Corporate debt securities 775 728
Mortgage-backed securities 466 478
Other debt securities 160 146
Other investments:    
Equity Securities 28 24
Debt securities 147 126
Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member]    
Derivatives:    
Derivative asset, netting (2,040) (2,811)
Derivative assets 1,772 1,840
Derivatives:    
Derivative liability, netting (1,979) (2,622)
Derivative liability 499 683
Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member]    
Derivatives:    
Derivative asset, netting 0 (7)
Derivative assets 19 49
Derivatives:    
Derivative liability, netting 0 (7)
Derivative liability 759 465
Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member]    
Derivatives:    
Derivative asset, netting 13 13
Derivative assets 22 30
Derivatives:    
Derivative liability, netting 13 13
Derivative liability 47 43
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member]    
Cash equivalents:    
Equity securities 805 486
Special use funds:    
Equity securities 1,606 1,445
U.S. Government and municipal bonds 466 449
Corporate debt securities 0 0
Mortgage-backed securities 0 0
Other debt securities 0 0
Other investments:    
Equity Securities 16 13
Debt securities 78 36
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 810 1,379
Derivatives:    
Derivative Liability, Gross Liability 850 1,329
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 0 0
Derivatives:    
Derivative Liability, Gross Liability 0 0
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member]    
Derivatives:    
Derivative Asset, Gross Asset 0 0
Derivatives:    
Derivative Liability, Gross Liability 0 0
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member]    
Cash equivalents:    
Equity securities 0 0
Special use funds:    
Equity securities 1,824 1,601
U.S. Government and municipal bonds 133 155
Corporate debt securities 775 728
Mortgage-backed securities 466 478
Other debt securities 160 145
Other investments:    
Equity Securities 12 11
Debt securities 69 90
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 1,659 1,923
Derivatives:    
Derivative Liability, Gross Liability 1,276 1,410
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 19 56
Derivatives:    
Derivative Liability, Gross Liability 612 336
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member]    
Derivatives:    
Derivative Asset, Gross Asset 9 17
Derivatives:    
Derivative Liability, Gross Liability 34 30
Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member]    
Cash equivalents:    
Equity securities 0 0
Special use funds:    
Equity securities 0 0
U.S. Government and municipal bonds 0 0
Corporate debt securities 0 0
Mortgage-backed securities 0 0
Other debt securities 0 1
Other investments:    
Equity Securities 0 0
Debt securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 1,343 1,349
Derivatives:    
Derivative Liability, Gross Liability 352 566
Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 0 0
Derivatives:    
Derivative Liability, Gross Liability 147 136
Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member]    
Derivatives:    
Derivative Asset, Gross Asset 0 0
Derivatives:    
Derivative Liability, Gross Liability 0 0
Other Current Assets [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member]    
Derivatives:    
Restricted cash 68 85
Other Noncurrent Assets [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member]    
Derivatives:    
Restricted cash 62  
FPL [Member]    
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]    
Special Use Funds Storm Fund Assets 69 68
Derivatives:    
Derivative assets 5 0
Derivatives:    
Derivative liability 19 41
Restricted cash 122 142
FPL [Member] | Fair value measurements made on a recurring basis [Member]    
Cash equivalents:    
Equity securities 171 206
Special use funds:    
Equity securities 2,109 1,850
U.S. Government and municipal bonds 445 470
Corporate debt securities 564 544
Mortgage-backed securities 354 367
Other debt securities 136 132
FPL [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member]    
Derivatives:    
Derivative asset, netting (2) (2)
Derivative assets 5 0
Derivatives:    
Derivative liability, netting (2) (2)
Derivative liability 19 41
FPL [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member]    
Cash equivalents:    
Equity securities 171 206
Special use funds:    
Equity securities 454 398
U.S. Government and municipal bonds 341 350
Corporate debt securities 0 0
Mortgage-backed securities 0 0
Other debt securities 0 0
FPL [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 0 0
Derivatives:    
Derivative Liability, Gross Liability 0 0
FPL [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member]    
Cash equivalents:    
Equity securities 0 0
Special use funds:    
Equity securities 1,655 1,452
U.S. Government and municipal bonds 104 120
Corporate debt securities 564 544
Mortgage-backed securities 354 367
Other debt securities 136 131
FPL [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 6 2
Derivatives:    
Derivative Liability, Gross Liability 4 7
FPL [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member]    
Cash equivalents:    
Equity securities 0 0
Special use funds:    
Equity securities 0 0
U.S. Government and municipal bonds 0 0
Corporate debt securities 0 0
Mortgage-backed securities 0 0
Other debt securities 0 1
FPL [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member]    
Derivatives:    
Derivative Asset, Gross Asset 1 0
Derivatives:    
Derivative Liability, Gross Liability 17 36
FPL [Member] | Other Current Assets [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member]    
Derivatives:    
Restricted cash 61 $ 81
FPL [Member] | Other Noncurrent Assets [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member]    
Derivatives:    
Restricted cash $ 62