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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | $ 476 | $ 508
Derivatives: |  |
Derivative assets | 2,063 | 2,386
Derivatives: |  |
Derivative liability | 1,890 | 1,340
Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 1,804 | 363
Special use funds: |  |
Equity securities | 4,181 | 3,963
U.S. Government and municipal bonds | 679 | 717
Corporate debt securities | 851 | 748
Mortgage-backed securities | 440 | 517
Other debt securities | 112 | 117
Other investments: |  |
Equity Securities | 61 | 46
Debt securities | 202 | 151
Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2,396) | (2,700)
Derivative assets | 2,039 | 2,350
Derivatives: |  |
Derivative liability, netting | (2,252) | (2,625)
Derivative liability | 543 | 576
Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (28) | (17)
Derivative assets | 5 | 9
Derivatives: |  |
Derivative liability, netting | (28) | (17)
Derivative liability | 1,296 | 725
Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset, netting | 4 | 1
Derivative assets | 19 | 27
Derivatives: |  |
Derivative liability, netting | 4 | 1
Derivative liability | 51 | 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 | 1,804 | 363
Special use funds: |  |
Equity securities | 1,994 | 1,875
U.S. Government and municipal bonds | 522 | 567
Corporate debt securities | 1 | 0
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other investments: |  |
Equity Securities | 61 | 34
Debt securities | 93 | 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 | 1,029 | 1,229
Derivatives: |  |
Derivative Liability, Gross Liability | 1,027 | 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 | 2,187 | 2,088
U.S. Government and municipal bonds | 157 | 150
Corporate debt securities | 850 | 748
Mortgage-backed securities | 440 | 517
Other debt securities | 112 | 117
Other investments: |  |
Equity Securities | 0 | 12
Debt securities | 109 | 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 | 1,796 | 2,082
Derivatives: |  |
Derivative Liability, Gross Liability | 1,328 | 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 | 33 | 24
Derivatives: |  |
Derivative Liability, Gross Liability | 1,304 | 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 | 15 | 26
Derivatives: |  |
Derivative Liability, Gross Liability | 47 | 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 | 1,610 | 1,739
Derivatives: |  |
Derivative Liability, Gross Liability | 440 | 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 | 20 | 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 | 231 | 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 | 82 | 64
FPL [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | 114 | 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 | 191 | 156
Special use funds: |  |
Equity securities | 2,663 | 2,491
U.S. Government and municipal bonds | 508 | 535
Corporate debt securities | 600 | 533
Mortgage-backed securities | 348 | 395
Other debt securities | 107 | 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 | 191 | 156
Special use funds: |  |
Equity securities | 680 | 596
U.S. Government and municipal bonds | 405 | 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 | 1,983 | 1,895
U.S. Government and municipal bonds | 103 | 106
Corporate debt securities | 600 | 533
Mortgage-backed securities | 348 | 395
Other debt securities | 107 | 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 | 73 | 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 | $ 41 | $ 64

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