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Contingencies and Commitments (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
agreement
Guarantees Letters Of Credit [Abstract]  
The range of expiration dates of guarantees made by the Parent Company less than one year to more than 21 years
Lower limit of expiration dates of guarantees (less than one year) 1 year
Upper limit of expiration dates of guarantees (more than 21 years) 21 years
Obligations made by the Parent Company associated with non-recourse debt $ 24
Contingent Contractual Obligations [Line Items]  
Amount 849
Number of agreements 36
Guarantees [Member]
  
Contingent Contractual Obligations [Line Items]  
Amount 654
Number of agreements 21
Maximum exposure range for each agreement <$1 - 275
Maximum exposure range, lower limit (less than $1 for Guarantees and commitments and Letters of credit under the senior secured credit facility) 1
Maximum exposure range, upper limit 275
Cash Collateralized Letters Of Credit [Member]
  
Contingent Contractual Obligations [Line Items]  
Amount 192
Number of agreements 11
Maximum exposure range for each agreement <$1 - 132
Maximum exposure range, lower limit (less than $1 for Guarantees and commitments and Letters of credit under the senior secured credit facility) 1
Maximum exposure range, upper limit 132
Letters of credit under secured credit facility [Member]
  
Contingent Contractual Obligations [Line Items]  
Amount 3
Number of agreements 4
Maximum exposure range for each agreement <$1 - 2
Maximum exposure range, lower limit (less than $1 for Guarantees and commitments and Letters of credit under the senior secured credit facility) 1
Maximum exposure range, upper limit $ 2
Letters of credit under secured credit facility [Member] | Minimum [Member]
  
Contingent Contractual Obligations [Line Items]  
Letter of credit fees paid 0.20%
Letters of credit under secured credit facility [Member] | Maximum [Member]
  
Contingent Contractual Obligations [Line Items]  
Letter of credit fees paid 2.50%