Regulatory Assets and Liabilities (Details) (Brazil Tariff Estimated Rate Change Liability [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2012
Brazil Tariff Estimated Rate Change Liability [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 536
Regulatory Liabilities Change Recognized During Period	$ 80

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 71

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_RegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant