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Regulatory Assets and Liabilities Regulatory Assets and Liabilities - by Reportable Segment (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets $ 918 $ 1,279
Regulatory Liabilities 2,053 2,090
Brazil SBU
    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets 260 427
Regulatory Liabilities 1,336 1,390
US
    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets 550 737
Regulatory Liabilities 717 700
MCAC
    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Regulatory Assets 108 115
Regulatory Liabilities $ 0 $ 0