Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans (Details Textuals)

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Benefit Plans (Details Textuals) (USD $)
3 Months Ended
Sep. 30, 2012
Benefit Plans (Textuals) [Abstract]  
Contribution to plan $ 75,000,000
Employees retirement age for health care and life insurance benefits under unfunded defined benefit post-retirement plan 55 years
Employees vesting service under defined benefit post-retirement plan, minimum 10 years
Life insurance coverage, maximum $ 50,000
Average duration of plan assets investment in bonds, years P3.7Y
Target allocation of plan assets in equity, percentage range minimum 20.00%
Target allocation of plan assets in equity, percentage range maximum 50.00%
Target allocation of plan assets in bonds, percentage range minimum 80.00%
Target allocation of plan assets in bonds, percentage range maximum 50.00%
Base pay contributed to the plan up to the first 3%
Attributes of employees contribution to defined contribution plan Half of the employee contribution is matched on the 4th and 5th percent of base pay contributed to the Plan
Equity Securities [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Fair value of plan assets, Percentage 55.00%
Covered Bonds [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Fair value of plan assets, Percentage 41.00%
Cash and Cash Equivalents [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Fair value of plan assets, Percentage 4.00%