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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 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 | 2,431 | 1,919
Derivatives: |  |
Derivative liability | 1,235 | 1,191
Restricted cash | 684 | 4,615
Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 861 | 486
Special use funds: |  |
Equity securities | 3,569 | 3,046
U.S. Government and municipal bonds | 674 | 604
Corporate debt securities | 747 | 728
Mortgage-backed securities | 444 | 478
Other debt securities | 157 | 146
Other investments: |  |
Equity Securities | 30 | 24
Debt securities | 174 | 126
Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2,753) | (2,811)
Derivative assets | 2,399 | 1,840
Derivatives: |  |
Derivative liability, netting | (2,965) | (2,622)
Derivative liability | 629 | 683
Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (5) | (7)
Derivative assets | 9 | 49
Derivatives: |  |
Derivative liability, netting | (5) | (7)
Derivative liability | 569 | 465
Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset, netting | 0 | 13
Derivative assets | 23 | 30
Derivatives: |  |
Derivative liability, netting | 0 | 13
Derivative liability | 37 | 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 | 861 | 486
Special use funds: |  |
Equity securities | 1,679 | 1,445
U.S. Government and municipal bonds | 561 | 449
Corporate debt securities | 0 | 0
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other investments: |  |
Equity Securities | 18 | 13
Debt securities | 106 | 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 | 1,296 | 1,379
Derivatives: |  |
Derivative Liability, Gross Liability | 1,493 | 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 | 1,890 | 1,601
U.S. Government and municipal bonds | 113 | 155
Corporate debt securities | 747 | 728
Mortgage-backed securities | 444 | 478
Other debt securities | 157 | 145
Other investments: |  |
Equity Securities | 12 | 11
Debt securities | 68 | 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 | 2,088 | 1,923
Derivatives: |  |
Derivative Liability, Gross Liability | 1,709 | 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 | 14 | 56
Derivatives: |  |
Derivative Liability, Gross Liability | 429 | 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 | 23 | 17
Derivatives: |  |
Derivative Liability, Gross Liability | 37 | 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 | 1,768 | 1,349
Derivatives: |  |
Derivative Liability, Gross Liability | 392 | 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 | 145 | 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 | 92 | 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 | 90 |
FPL [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Special Use Funds Storm Fund Assets | 69 | 68
Derivatives: |  |
Derivative assets | 6 | 0
Derivatives: |  |
Derivative liability | 17 | 41
Restricted cash | 167 | 142
FPL [Member] | Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 209 | 206
Special use funds: |  |
Equity securities | 2,235 | 1,850
U.S. Government and municipal bonds | 505 | 470
Corporate debt securities | 534 | 544
Mortgage-backed securities | 334 | 367
Other debt securities | 133 | 132
FPL [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2) | (2)
Derivative assets | 6 | 0
Derivatives: |  |
Derivative liability, netting | (2) | (2)
Derivative liability | 17 | 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 | 209 | 206
Special use funds: |  |
Equity securities | 520 | 398
U.S. Government and municipal bonds | 417 | 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 | 1,715 | 1,452
U.S. Government and municipal bonds | 88 | 120
Corporate debt securities | 534 | 544
Mortgage-backed securities | 334 | 367
Other debt securities | 133 | 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 | 7 | 2
Derivatives: |  |
Derivative Liability, Gross Liability | 5 | 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 | 14 | 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 | 77 | $ 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 | $ 90 |

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