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Financing Receivables (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Lease investment with non-investment grade counterparties, gross $ 563
Lease investment with non-investment grade counterparties, net of deferred taxes 13
NRG commitment to invest $ 350
Powerton Station [Member]
 
Lease Receivable Percent Owned 64.00%