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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2015
Litigation Contingencies |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) | $ (1) |  | $ 14 |  |
Environmental Remediation Contingency [Domain] |  |  |  |  |
Environmental Contingencies |  |  |  |  |
Liability recorded for projected environmental remediation costs | 10 |  |  |  | $ 10
Litigation Contingencies |  |  |  |  |
Maximum potential loss | 1 |  |  |  |
Litigation [Member] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Minimum potential loss | 1,300 |  |  |  |
Maximum potential loss | 1,600 |  |  |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | $ 234 |  |  |  | $ 189
Regulatory Liability [Domain] | Eletropaulo [Domain] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  | $ 161 |  | $ (269) |
Regulated Revenue [Member] | Regulatory Liability [Domain] | Eletropaulo [Domain] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  | 97 |  |  |
Interest Expense [Member] | Regulatory Liability [Domain] | Eletropaulo [Domain] |  |  |  |  |
Litigation Contingencies |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  | $ 64 |  |  |

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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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