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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | $ 1,294 | $ 982
Special use funds [Abstract] |  |
Equity securities | 3,314 | 2,913
U.S. Government and municipal bonds | 617 | 466
Corporate debt securities | 765 | 764
Mortgage-backed securities | 435 | 498
Other debt securities | 129 | 81
Other Investments [Abstract] |  |
Equity securities | 12 | 35
Debt securities | 137 | 161
Derivatives [Abstract] |  |
Commodity contracts | 1,737 | 1,938
Interest rate contracts | 55 | 296
Foreign currency contracts | 12 | 1
Derivatives [Abstract] |  |
Commodity contracts | 567 | 483
Interest rate contracts | 280 | 292
Foreign currency contracts | 52 | 106
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 1,294 | 982
Special use funds [Abstract] |  |
Equity securities | 1,595 | 1,410
U.S. Government and municipal bonds | 478 | 296
Corporate debt securities | 1 | 1
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Other Investments [Abstract] |  |
Equity securities | 2 | 26
Debt securities | 34 | 8
Derivatives [Abstract] |  |
Commodity contracts | 1,303 | 1,563
Interest rate contracts | 0 | 0
Foreign currency contracts | 0 | 0
Derivatives [Abstract] |  |
Commodity contracts | 1,217 | 1,476
Interest rate contracts | 0 | 0
Foreign currency contracts | 0 | 0
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Current other assets [Member] |  |
Assets [Abstract] |  |
Restricted cash | 159 | 164
Fair Value, Inputs, Level 2 [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 0 | 0
Special use funds [Abstract] |  |
Equity securities | 1,719 | 1,503
U.S. Government and municipal bonds | 139 | 170
Corporate debt securities | 764 | 763
Mortgage-backed securities | 435 | 498
Other debt securities | 129 | 81
Other Investments [Abstract] |  |
Equity securities | 10 | 9
Debt securities | 103 | 153
Derivatives [Abstract] |  |
Commodity contracts | 1,301 | 1,827
Interest rate contracts | 50 | 285
Foreign currency contracts | 0 | 1
Derivatives [Abstract] |  |
Commodity contracts | 915 | 980
Interest rate contracts | 143 | 171
Foreign currency contracts | 40 | 106
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 0 | 0
Special use funds [Abstract] |  |
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 [Abstract] |  |
Equity securities | 0 | 0
Debt securities | 0 | 0
Derivatives [Abstract] |  |
Commodity contracts | 1,358 | 1,200
Interest rate contracts | 0 | 3
Foreign currency contracts | 0 | 0
Derivatives [Abstract] |  |
Commodity contracts | 660 | 512
Interest rate contracts | 132 | 113
Foreign currency contracts | 0 | 0
Commodity contracts [Member] |  |
Derivatives [Abstract] |  |
Asset offsetting | (2,225) | (2,652)
Derivatives [Abstract] |  |
Liability offsetting | (2,225) | 2,485
Interest Rate Contract [Member] |  |
Derivatives [Abstract] |  |
Asset offsetting | 5 | 8
Derivatives [Abstract] |  |
Liability offsetting | 5 | 8
Currency Swap [Member] |  |
Derivatives [Abstract] |  |
Asset offsetting | (12) | 0
Derivatives [Abstract] |  |
Liability offsetting | 12 |
FPL[Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 144 | 120
Special use funds [Abstract] |  |
Equity securities | 2,035 | 1,745
U.S. Government and municipal bonds | 474 | 362
Corporate debt securities | 539 | 547
Mortgage-backed securities | 333 | 384
Other debt securities | 116 | 70
Derivatives [Abstract] |  |
Commodity contracts | 2 | 209
Derivatives [Abstract] |  |
Commodity contracts | 2 | 1
FPL[Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 144 | 120
Special use funds [Abstract] |  |
Equity securities | 473 | 373
U.S. Government and municipal bonds | 362 | 221
Corporate debt securities | 0 | 0
Mortgage-backed securities | 0 | 0
Other debt securities | 0 | 0
Derivatives [Abstract] |  |
Commodity contracts | 0 | 0
Derivatives [Abstract] |  |
Commodity contracts | 0 | 0
FPL[Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Current other assets [Member] |  |
Assets [Abstract] |  |
Restricted cash | 128 | 120
FPL[Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 0 | 0
Special use funds [Abstract] |  |
Equity securities | 1,562 | 1,372
U.S. Government and municipal bonds | 112 | 141
Corporate debt securities | 539 | 547
Mortgage-backed securities | 333 | 384
Other debt securities | 116 | 70
Derivatives [Abstract] |  |
Commodity contracts | 1 | 208
Derivatives [Abstract] |  |
Commodity contracts | 1 | 1
FPL[Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 0 | 0
Special use funds [Abstract] |  |
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
Derivatives [Abstract] |  |
Commodity contracts | 2 | 4
Derivatives [Abstract] |  |
Commodity contracts | 2 | 3
FPL[Member] | Commodity contracts [Member] |  |
Derivatives [Abstract] |  |
Asset offsetting | (1) | (3)
Derivatives [Abstract] |  |
Liability offsetting | $ (1) | $ 3

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. This element represents other debt securities of special use funds. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value of liability associated with financial asset or other 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, and obligation to return cash collateral under master netting arrangements. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226003-175313 + Details
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- Definition Fair value of asset associated with 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, and right to receive cash collateral under master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226003-175313 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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