Consolidated Balance Sheets (Parentheticals)	Dec. 31, 2011	Dec. 31, 2010
Balance Sheets Parentheticals [Line Items]
Common shares, authorized	500,000,000	500,000,000
Common shares, issued	295,000,000	293,000,000
Common shares, outstanding	295,000,000	293,000,000
PEC
Balance Sheets Parentheticals [Line Items]
Common shares, authorized	200,000,000	200,000,000
Common shares, issued	160,000,000	160,000,000
Common shares, outstanding	160,000,000	160,000,000
PEF
Balance Sheets Parentheticals [Line Items]
Common shares, authorized	60,000,000	60,000,000
Common shares, issued	100	100
Common shares, outstanding	100	100