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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | $ 427 | $ 508
Derivatives: |  |
Derivative assets | 2,470 | 2,386
Derivatives: |  |
Derivative liability | 2,052 | 1,340
Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 654 | 363
Special use funds: |  |
Equity securities | 3,824 | 3,963
U.S. Government and municipal bonds | 694 | 717
Corporate debt securities | 882 | 748
Mortgage-backed securities | 421 | 517
Other debt securities | 100 | 117
Other investments: |  |
Equity Securities | 45 | 46
Debt securities | 207 | 151
Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (3,010) | (2,700)
Derivative assets | 2,463 | 2,350
Derivatives: |  |
Derivative liability, netting | (2,882) | (2,625)
Derivative liability | 546 | 576
Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (30) | (17)
Derivative assets | 8 | 9
Derivatives: |  |
Derivative liability, netting | (30) | (17)
Derivative liability | 1,440 | 725
Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset, netting | (1) | 1
Derivative assets | (1) | 27
Derivatives: |  |
Derivative liability, netting | (1) | 1
Derivative liability | 66 | 39
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 | 654 | 363
Special use funds: |  |
Equity securities | 1,799 | 1,875
U.S. Government and municipal bonds | 525 | 567
Corporate debt securities | 1 | 0
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other investments: |  |
Equity Securities | 45 | 34
Debt securities | 95 | 82
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 | 1,286 | 1,229
Derivatives: |  |
Derivative Liability, Gross Liability | 1,390 | 1,365
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 | 2,025 | 2,088
U.S. Government and municipal bonds | 169 | 150
Corporate debt securities | 881 | 748
Mortgage-backed securities | 421 | 517
Other debt securities | 100 | 117
Other investments: |  |
Equity Securities | 0 | 12
Debt securities | 112 | 69
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative Asset, Gross Asset | 2,429 | 2,082
Derivatives: |  |
Derivative Liability, Gross Liability | 1,606 | 1,446
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 | 38 | 24
Derivatives: |  |
Derivative Liability, Gross Liability | 1,449 | 598
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 | 26
Derivatives: |  |
Derivative Liability, Gross Liability | 67 | 38
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 | 1,758 | 1,739
Derivatives: |  |
Derivative Liability, Gross Liability | 432 | 390
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 | 2
Derivatives: |  |
Derivative Liability, Gross Liability | 21 | 144
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] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | 103 | 60
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] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | 97 | 64
FPL [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | 101 | 118
Derivatives: |  |
Derivative assets | 2 | 3
Derivatives: |  |
Derivative liability | 11 | 13
FPL [Member] | Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 123 | 156
Special use funds: |  |
Equity securities | 2,426 | 2,491
U.S. Government and municipal bonds | 526 | 535
Corporate debt securities | 626 | 533
Mortgage-backed securities | 325 | 395
Other debt securities | 92 | 111
FPL [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2) | (1)
Derivative assets | 2 | 3
Derivatives: |  |
Derivative liability, netting | (2) | (1)
Derivative liability | 11 | 13
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 | 123 | 156
Special use funds: |  |
Equity securities | 589 | 596
U.S. Government and municipal bonds | 415 | 429
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 | 1,837 | 1,895
U.S. Government and municipal bonds | 111 | 106
Corporate debt securities | 626 | 533
Mortgage-backed securities | 325 | 395
Other debt securities | 92 | 111
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 | 3
Derivatives: |  |
Derivative Liability, Gross Liability | 5 | 5
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 | 1
Derivatives: |  |
Derivative Liability, Gross Liability | 8 | 9
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] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | 56 | 54
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] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | $ 46 | $ 64

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