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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Special Use Funds Storm Fund Assets | $ 70 | $ 68
Derivatives: |  |
Derivative assets | 2,229 | 1,919
Derivatives: |  |
Derivative liability | 1,472 | 1,191
Restricted cash | 427 | 4,615
Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 924 | 486
Special use funds: |  |
Equity securities | 3,634 | 3,046
U.S. Government and municipal bonds | 696 | 604
Corporate debt securities | 777 | 728
Mortgage-backed securities | 452 | 478
Other debt securities | 116 | 146
Other investments: |  |
Equity Securities | 30 | 24
Debt securities | 172 | 126
Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2,213) | (2,811)
Derivative assets | 2,203 | 1,840
Derivatives: |  |
Derivative liability, netting | (2,156) | (2,622)
Derivative liability | 495 | 683
Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (21) | (7)
Derivative assets | 6 | 49
Derivatives: |  |
Derivative liability, netting | (21) | (7)
Derivative liability | 935 | 465
Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset, netting | 0 | 13
Derivative assets | 20 | 30
Derivatives: |  |
Derivative liability, netting | 0 | 13
Derivative liability | 42 | 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 | 924 | 486
Special use funds: |  |
Equity securities | 1,725 | 1,445
U.S. Government and municipal bonds | 552 | 449
Corporate debt securities | 0 | 0
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other investments: |  |
Equity Securities | 18 | 13
Debt securities | 105 | 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 | 1,003 | 1,379
Derivatives: |  |
Derivative Liability, Gross Liability | 1,030 | 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 | 1,909 | 1,601
U.S. Government and municipal bonds | 144 | 155
Corporate debt securities | 777 | 728
Mortgage-backed securities | 452 | 478
Other debt securities | 116 | 145
Other investments: |  |
Equity Securities | 12 | 11
Debt securities | 67 | 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 | 1,827 | 1,923
Derivatives: |  |
Derivative Liability, Gross Liability | 1,232 | 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 | 27 | 56
Derivatives: |  |
Derivative Liability, Gross Liability | 810 | 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 | 20 | 17
Derivatives: |  |
Derivative Liability, Gross Liability | 42 | 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 | 1,586 | 1,349
Derivatives: |  |
Derivative Liability, Gross Liability | 389 | 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 | 146 | 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 | 66 | 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 | 89 |
FPL [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Special Use Funds Storm Fund Assets | 70 | 68
Derivatives: |  |
Derivative assets | 7 | 0
Derivatives: |  |
Derivative liability | 16 | 41
Restricted cash | 151 | 142
FPL [Member] | Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 196 | 206
Special use funds: |  |
Equity securities | 2,284 | 1,850
U.S. Government and municipal bonds | 525 | 470
Corporate debt securities | 542 | 544
Mortgage-backed securities | 344 | 367
Other debt securities | 106 | 132
FPL [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (3) | (2)
Derivative assets | 7 | 0
Derivatives: |  |
Derivative liability, netting | (3) | (2)
Derivative liability | 16 | 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 | 196 | 206
Special use funds: |  |
Equity securities | 553 | 398
U.S. Government and municipal bonds | 420 | 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 | 1,731 | 1,452
U.S. Government and municipal bonds | 105 | 120
Corporate debt securities | 542 | 544
Mortgage-backed securities | 344 | 367
Other debt securities | 106 | 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 | 9 | 2
Derivatives: |  |
Derivative Liability, Gross Liability | 8 | 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 | 11 | 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 | 62 | $ 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 | $ 89 |

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