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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2013 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Litigation Contingencies |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  |  | $ 21 | $ (134) |
Environmental Remediation Contingency [Domain] |  |  |  |  |
Environmental Contingencies |  |  |  |  |
Liability recorded for projected environmental remediation costs |  |  | 10 |  | $ 10
Litigation [Member] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Aggregate reserves for claims deemed both probable and reasonably estimable |  |  | 208 |  | $ 179
Unfavorable Regulatory Action [Member] | Eletropaulo [Domain] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) | $ 161 | $ (269) |  |  |
Regulated Revenue [Member] | Unfavorable Regulatory Action [Member] | Eletropaulo [Domain] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) | 97 |  |  |  |
Interest Expense [Member] | Unfavorable Regulatory Action [Member] | Eletropaulo [Domain] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) | $ 64 |  |  |  |
Maximum [Member] | Environmental Remediation Contingency [Domain] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) |  |  | 22 |  |
Maximum [Member] | Litigation [Member] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) |  |  | 1,725 |  |
Minimum [Member] | Litigation [Member] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) |  |  | $ 1,448 |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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