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
-Paragraph 1
-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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The estimated maximum amount of possible loss from the contingency.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 20
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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