v3.7.0.1

Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives: |  |
Derivative assets | $ 1,974 | $ 2,235
Derivatives: |  |
Derivative liability | 784 | 881
Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 359 | 982
Special use funds: |  |
Equity securities | 3,168 | 2,913
U.S. Government and municipal bonds | 516 | 466
Corporate debt securities | 804 | 764
Mortgage-backed securities | 458 | 498
Other debt securities | 117 | 81
Other investments: |  |
Equity Securities | 33 | 35
Debt securities | 144 | 161
Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2,595) | (2,652)
Derivative assets | 1,814 | 1,938
Derivatives: |  |
Derivative liability, netting | (2,454) | (2,485)
Derivative liability | 429 | 483
Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (2) | 8
Derivative assets | 152 | 296
Derivatives: |  |
Derivative liability, netting | (2) | 8
Derivative liability | 304 | 292
Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset, netting | 8 | 0
Derivative assets | 8 | 1
Derivatives: |  |
Derivative liability, netting | 8 | 0
Derivative liability | 51 | 106
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 | 359 | 982
Special use funds: |  |
Equity securities | 1,547 | 1,410
U.S. Government and municipal bonds | 354 | 296
Corporate debt securities | 1 | 1
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other investments: |  |
Equity Securities | 23 | 26
Debt securities | 7 | 8
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 before netting | 1,543 | 1,563
Derivatives: |  |
Derivative liability before netting | 1,461 | 1,476
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 before netting | 0 | 0
Derivatives: |  |
Derivative liability before netting | 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 before netting | 0 | 0
Derivatives: |  |
Derivative liability before netting | 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 | 1,621 | 1,503
U.S. Government and municipal bonds | 162 | 170
Corporate debt securities | 803 | 763
Mortgage-backed securities | 458 | 498
Other debt securities | 117 | 81
Other investments: |  |
Equity Securities | 10 | 9
Debt securities | 137 | 153
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset before netting | 1,541 | 1,827
Derivatives: |  |
Derivative liability before netting | 938 | 980
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset before netting | 154 | 285
Derivatives: |  |
Derivative liability before netting | 189 | 171
Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset before netting | 0 | 1
Derivatives: |  |
Derivative liability before netting | 43 | 106
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 before netting | 1,325 | 1,200
Derivatives: |  |
Derivative liability before netting | 484 | 512
Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member] | Interest Rate Contract [Member] |  |
Derivatives: |  |
Derivative asset before netting | 0 | 3
Derivatives: |  |
Derivative liability before netting | 117 | 113
Significant Unobservable Inputs (Level 3) [Member] | Fair value measurements made on a recurring basis [Member] | Foreign Currency Swap [Member] |  |
Derivatives: |  |
Derivative asset before netting | 0 | 0
Derivatives: |  |
Derivative liability before netting | 0 | 0
Other Current Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | 142 | 164
FPL [Member] |  |
Derivatives: |  |
Derivative assets | 18 | 209
Derivatives: |  |
Derivative liability | 2 | 1
FPL [Member] | Fair value measurements made on a recurring basis [Member] |  |
Cash equivalents: |  |
Equity securities | 104 | 120
Special use funds: |  |
Equity securities | 1,902 | 1,745
U.S. Government and municipal bonds | 388 | 362
Corporate debt securities | 575 | 547
Mortgage-backed securities | 351 | 384
Other debt securities | 106 | 70
FPL [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset, netting | (9) | (3)
Derivative assets | 18 | 209
Derivatives: |  |
Derivative liability, netting | (9) | (3)
Derivative liability | 2 | 1
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 | 104 | 120
Special use funds: |  |
Equity securities | 424 | 373
U.S. Government and municipal bonds | 253 | 221
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 before netting | 0 | 0
Derivatives: |  |
Derivative liability before netting | 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 | 1,478 | 1,372
U.S. Government and municipal bonds | 135 | 141
Corporate debt securities | 575 | 547
Mortgage-backed securities | 351 | 384
Other debt securities | 106 | 70
FPL [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value measurements made on a recurring basis [Member] | Commodity Contract [Member] |  |
Derivatives: |  |
Derivative asset before netting | 26 | 208
Derivatives: |  |
Derivative liability before netting | 8 | 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 before netting | 1 | 4
Derivatives: |  |
Derivative liability before netting | 3 | 3
FPL [Member] | Other Current Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring [Line Items] |  |
Restricted cash | $ 92 | $ 120

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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