Commitments And Contingencies (PHI's Cross-Border Leases) (Details) (USD $)	3 Months Ended	6 Months Ended		1 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended
	Mar. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 PHI [Member]	Jan. 31, 2011 PHI [Member]	Jun. 30, 2011 PHI [Member]	Dec. 31, 2010 PHI [Member]	Dec. 31, 2009 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		1,329,000,000	1,423,000,000	1,300,000,000		1,300,000,000
Federal and State income tax benefits						486,000,000			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	2,000,000
After-tax non-cash earnings benefit							3,000,000
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						612,000,000
Potential tax liability in the event of a total disallowance				717,000,000		717,000,000
Potential interest on potential tax liability related to disallowed tax benefits				$ 105,000,000		$ 105,000,000
Maximum tax penalty percentage						20.00%