Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 450
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-Section 50
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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Litigation Contingencies
Loss Contingency Accrual, Period Increase (Decrease)			$ 28	$ (91)
Environmental Remediation Contingency [Domain]
Environmental Contingencies
Liability recorded for projected environmental remediation costs			11		$ 10
Litigation [Member]
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable			177		$ 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)			21
Maximum [Member] \| Litigation [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)			1,700
Minimum [Member] \| Litigation [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)			$ 1,400