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Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | $ 703 | $ 441
Derivatives: |  |
Derivative assets | 2,114 | 2,217
Derivatives: |  |
Derivative liability | 1,032 | 1,510
NEER Segment |  |
Derivatives: |  |
Contingent consideration liabilities | 264 |
Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 699 | 742
Special use funds: |  |
Equity securities | 4,979 | 4,726
U.S. Government and municipal bonds | 775 | 717
Corporate debt securities | 830 | 871
Mortgage-backed securities | 434 | 422
Other debt securities | 139 | 124
Other investments: |  |
Equity Securities | 70 | 62
Debt securities | 239 | 218
Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2,197) | (2,325)
Derivative assets | 1,970 | 2,154
Derivatives: |  |
Derivative liability, netting | (2,176) | (2,277)
Derivative liability | 663 | 500
Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (69) | (41)
Derivative assets | 149 | 40
Derivatives: |  |
Derivative liability, netting | (69) | (41)
Derivative liability | 349 | 1,001
Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset, netting | (40) | (34)
Derivative assets | (5) | 23
Derivatives: |  |
Derivative liability, netting | (40) | (34)
Derivative liability | 20 | 9
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 | 699 | 742
Special use funds: |  |
Equity securities | 2,329 | 2,237
U.S. Government and municipal bonds | 712 | 590
Corporate debt securities | 1 | 1
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other investments: |  |
Equity Securities | 70 | 62
Debt securities | 104 | 91
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 | 775 | 919
Derivatives: |  |
Derivative Liability, Gross Liability | 858 | 1,004
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 | 2,650 | 2,489
U.S. Government and municipal bonds | 63 | 127
Corporate debt securities | 829 | 870
Mortgage-backed securities | 434 | 422
Other debt securities | 139 | 124
Other investments: |  |
Equity Securities | 0 | 0
Debt securities | 120 | 127
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative Asset, Gross Asset | 1,893 | 1,881
Derivatives: |  |
Derivative Liability, Gross Liability | 1,639 | 1,468
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 | 218 | 81
Derivatives: |  |
Derivative Liability, Gross Liability | 418 | 1,042
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 | 35 | 57
Derivatives: |  |
Derivative Liability, Gross Liability | 60 | 43
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 | 15 | 0
Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative Asset, Gross Asset | 1,499 | 1,679
Derivatives: |  |
Derivative Liability, Gross Liability | 342 | 305
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 | 0 | 0
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 | 85 | 111
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 | 9 | 42
FPL [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | 94 | 135
Derivatives: |  |
Derivative liability |  | 3
FPL [Member] | Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 97 | 137
Special use funds: |  |
Equity securities | 3,196 | 3,012
U.S. Government and municipal bonds | 605 | 536
Corporate debt securities | 618 | 627
Mortgage-backed securities | 328 | 335
Other debt securities | 126 | 119
Other investments: |  |
Equity Securities | 12 | 12
FPL [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (1) | 0
Derivative assets | 2 | 3
Derivatives: |  |
Derivative liability, netting | (1) | 0
Derivative liability | 8 | 3
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 | 97 | 137
Special use funds: |  |
Equity securities | 791 | 752
U.S. Government and municipal bonds | 558 | 449
Corporate debt securities | 0 | 0
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other investments: |  |
Equity Securities | 12 | 12
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 | 2,405 | 2,260
U.S. Government and municipal bonds | 47 | 87
Corporate debt securities | 618 | 627
Mortgage-backed securities | 328 | 335
Other debt securities | 126 | 119
Other investments: |  |
Equity Securities | 0 | 0
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 | 1 | 1
Derivatives: |  |
Derivative Liability, Gross Liability | 5 | 0
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
Other investments: |  |
Equity 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 | 3
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 | 84 | 91
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 | $ 9 | $ 42

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