Commitments And Contingencies (PHI's Cross-Border Leases) (Details) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended				1 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended	6 Months Ended
	Sep. 30, 2011		Mar. 31, 2011	Jun. 30, 2011	Sep. 30, 2011		Dec. 31, 2010		Jun. 30, 2011 PHI [Member]	Jan. 31, 2011 PHI [Member]	Jun. 30, 2011 PHI [Member]	Sep. 30, 2011 PHI [Member]	Dec. 31, 2010 PHI [Member]	Jun. 30, 2011 PCI [Member]
Number of cross-border energy lease investments held				8
Current annual tax benefits											$ 52,000,000
Investment in finance leases held in trust	1,336,000,000	[1]			1,336,000,000	[1]	1,423,000,000	[1]				1,300,000,000
Federal and state income tax benefits					499,000,000									56,000,000
Aggregate book value of tax benefits			1,400,000,000
Tax payment made										74,000,000
Interest and penalties										1,000,000
Interest expense assessed relating to disallowed deductions									28,000,000
After-tax non-cash earnings charge													1,000,000
Proceeds from early termination of finance leases held in trust				161,000,000	161,000,000
Termination payment to retire non-recourse debt											423,000,000
Pre-tax gain on early termination of finance leases held in trust											39,000,000
Percentage of disallowed tax benefits associated with leases											100.00%
Additional federal and state taxes												628,000,000
Potential tax liability in the event of a total disallowance												744,000,000
Potential interest on potential tax liability related to disallowed tax benefits												116,000,000
Maximum tax penalty percentage												20.00%
Pre-tax charge related to equity investment write down	7,000,000
After-tax charge related to equity investment write down	$ 3,000,000

[1] Excludes the credit ratings associated with collateral posted by the lessees in these transactions.