Derivative Instruments And Hedging Activities Notional Contracts by Derivative Type (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014
economic hedges by derivative type [Line Items]
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	$ 3.5
Commodity WCS Spread [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	1,610,000
Commodity Price Swap WTS Spread [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	1,825,000
Commodity WTI Long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	365,000
Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	31,200,000
Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	31,200,000
Commodity WTI short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	1,043,000
Maturing in Next Twelve Months [Member] | Commodity WCS Spread [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	1,610,000
Maturing in Next Twelve Months [Member] | Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	2,400,000
Maturing in Next Twelve Months [Member] | Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	2,400,000
Maturing in Next Twelve Months [Member] | Commodity WTI short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	939,000
Maturing in Year Two [Member] | Commodity Price Swap WTS Spread [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	1,825,000
Maturing in Year Two [Member] | Commodity WTI Long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	365,000
Maturing in Year Two [Member] | Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000
Maturing in Year Two [Member] | Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000
Maturing in Year Two [Member] | Commodity WTI short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	104,000
Maturing in Year Three [Member] | Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000
Maturing in Year Three [Member] | Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000
Maturing in Year Four [Member] | Natural Gas - long [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000
Maturing in Year Four [Member] | Natural Gas - Short [Member]
economic hedges by derivative type [Line Items]
Economic Hedges Notional Contract Volumes	9,600,000