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Contingencies and Commitments (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
agreement
Sep. 30, 2015
USD ($)
agreement
Dec. 31, 2013
USD ($)
Loss Contingencies [Line Items]      
Regulatory Liabilities     $ 269
Guarantees Letters Of Credit [Abstract]      
The range of expiration dates of guarantees made by the Parent Company   less than one year to more than 19 years  
Obligations made by the Parent Company associated with non-recourse debt $ 14 $ 14  
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 482 $ 482  
Number of Agreements | agreement 29 29  
Guarantee Obligations [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 341 $ 341  
Number of Agreements | agreement 13 13  
Loss Contingency, Range of Possible Loss, Minimum $ 1 $ 1  
Loss Contingency, Range of Possible Loss, Maximum 53 53  
Indemnification Agreement [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted [1] $ 27 $ 27  
Number of Agreements | agreement [1] 1 1  
Loss Contingency, Range of Possible Loss, Minimum [1] $ 27 $ 27  
Loss Contingency, Range of Possible Loss, Maximum [1] 27 27  
Financial Standby Letter of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 82 $ 82  
Number of Agreements | agreement 10 10  
Loss Contingency, Range of Possible Loss, Minimum $ 1 $ 1  
Loss Contingency, Range of Possible Loss, Maximum 29 29  
Standby Letters of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 32 $ 32  
Number of Agreements | agreement 5 5  
Loss Contingency, Range of Possible Loss, Minimum $ 1 $ 1  
Loss Contingency, Range of Possible Loss, Maximum $ 15 $ 15  
Minimum [Member] | Standby Letters of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Letter of credit fee percentage paid 0.20%    
Maximum [Member] | Standby Letters of Credit [Member]      
Contingent Contractual Obligations [Line Items]      
Letter of credit fee percentage paid 2.50%    
[1] (1) Excludes normal and customary representations and warranties in agreements for the sale of assets (including ownership in associated legal entities) where the associated risk is considered to be nominal.