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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives: |  |
Derivative assets | $ 1,838 | $ 1,804
Derivatives: |  |
Derivative liability | 1,005 | 899
Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 255 | 1,294
Special use funds: |  |
Equity securities | 3,560 | 3,314
U.S. Government and municipal bonds | 634 | 617
Corporate debt securities | 726 | 765
Mortgage-backed securities | 428 | 435
Other debt securities | 146 | 129
Other investments: |  |
Equity Securities | 28 | 12
Debt securities | 131 | 137
Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2,431) | (2,225)
Derivative assets | 1,669 | 1,737
Derivatives: |  |
Derivative liability, netting | (2,355) | (2,225)
Derivative liability | 767 | 567
Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (7) | 5
Derivative assets | 156 | 55
Derivatives: |  |
Derivative liability, netting | (7) | 5
Derivative liability | 196 | 280
Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset, netting | 13 | 12
Derivative assets | 13 | 12
Derivatives: |  |
Derivative liability, netting | 13 | 12
Derivative liability | 42 | 52
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 | 255 | 1,294
Special use funds: |  |
Equity securities | 1,687 | 1,595
U.S. Government and municipal bonds | 479 | 478
Corporate debt securities | 1 | 1
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other investments: |  |
Equity Securities | 16 | 2
Debt securities | 44 | 34
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 | 1,256 | 1,303
Derivatives: |  |
Derivative Liability, Gross Liability | 1,224 | 1,217
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 | 1,873 | 1,719
U.S. Government and municipal bonds | 155 | 139
Corporate debt securities | 725 | 764
Mortgage-backed securities | 428 | 435
Other debt securities | 146 | 129
Other investments: |  |
Equity Securities | 12 | 10
Debt securities | 87 | 103
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative Asset, Gross Asset | 1,617 | 1,301
Derivatives: |  |
Derivative Liability, Gross Liability | 1,341 | 915
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 | 163 | 50
Derivatives: |  |
Derivative Liability, Gross Liability | 61 | 143
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 | 0 | 0
Derivatives: |  |
Derivative Liability, Gross Liability | 29 | 40
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 | 0
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 | 1,227 | 1,358
Derivatives: |  |
Derivative Liability, Gross Liability | 557 | 660
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 | 142 | 132
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 | 79 | 159
FPL [Member] |  |
Derivatives: |  |
Derivative assets | 3 | 2
Derivatives: |  |
Derivative liability | 3 | 2
FPL [Member] | Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 167 | 144
Special use funds: |  |
Equity securities | 2,179 | 2,035
U.S. Government and municipal bonds | 500 | 474
Corporate debt securities | 548 | 539
Mortgage-backed securities | 319 | 333
Other debt securities | 130 | 116
FPL [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (1) | (1)
Derivative assets | 3 | 2
Derivatives: |  |
Derivative liability, netting | (1) | (1)
Derivative liability | 3 | 2
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 | 167 | 144
Special use funds: |  |
Equity securities | 478 | 473
U.S. Government and municipal bonds | 380 | 362
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 | 1,701 | 1,562
U.S. Government and municipal bonds | 120 | 112
Corporate debt securities | 548 | 539
Mortgage-backed securities | 319 | 333
Other debt securities | 130 | 116
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 | 2 | 1
Derivatives: |  |
Derivative Liability, Gross Liability | 0 | 1
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 | 0
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 | 2 | 2
Derivatives: |  |
Derivative Liability, Gross Liability | 4 | 2
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 | $ 76 | $ 128

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