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Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets | $ 2,114 | $ 2,217
Derivative Asset, Current | 496 | 570
Derivative Asset, Noncurrent | 1,618 | 1,647
Derivative liability | 1,032 | 1,510
Derivative Liability, Current | 437 | 311
Derivative Liability, Noncurrent | 595 | 1,199
Non Current Derivative Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 66 | 184
Current derivative liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 45 | 136
Commodity Contract [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 1,970 | 2,154
Derivative liability | 663 | 500
Derivative asset, netting | (2,197) | (2,325)
Derivative liability, netting | (2,176) | (2,277)
Commodity Contract [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 775 | 919
Derivative Liability, Gross Liability | 858 | 1,004
Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 1,893 | 1,881
Derivative Liability, Gross Liability | 1,639 | 1,468
Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 1,499 | 1,679
Derivative Liability, Gross Liability | 342 | 305
Interest Rate Contract [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 149 | 40
Derivative liability | 349 | 1,001
Derivative asset, netting | (69) | (41)
Derivative liability, netting | (69) | (41)
Interest Rate Contract [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 0 | 0
Derivative Liability, Gross Liability | 0 | 0
Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 218 | 81
Derivative Liability, Gross Liability | 418 | 1,042
Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 0 | 0
Derivative Liability, Gross Liability | 0 | 0
Currency Swap [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | (5) | 23
Derivative liability | 20 | 9
Derivative asset, netting | (40) | (34)
Derivative liability, netting | (40) | (34)
Currency Swap [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 0 | 0
Derivative Liability, Gross Liability | 0 | 0
Currency Swap [Member] | Fair Value, Inputs, Level 2 [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 35 | 57
Derivative Liability, Gross Liability | 60 | 43
Currency Swap [Member] | Fair Value, Inputs, Level 3 [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 0 | 0
Derivative Liability, Gross Liability | 0 | 0
FPL [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability |  | 3
FPL [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Current | 8 | 2
FPL [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Noncurrent |  | 1
FPL [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | 2 | 3
FPL [Member] | Commodity Contract [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 2 | 3
Derivative liability | 8 | 3
Derivative asset, netting | (1) | 0
Derivative liability, netting | (1) | 0
FPL [Member] | Commodity Contract [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 0 | 0
Derivative Liability, Gross Liability | 0 | 0
FPL [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 1 | 1
Derivative Liability, Gross Liability | 5 | 0
FPL [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Fair value measurements made on a recurring basis [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Gross Asset | 2 | 2
Derivative Liability, Gross Liability | $ 4 | $ 3

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