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Benefit Plans Contributions (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Other Pension Plans, Defined Benefit
Sep. 30, 2009
Other Pension Plans, Defined Benefit
Jun. 30, 2014
Other Post-retirement Benefits
Jun. 30, 2013
Other Post-retirement Benefits
Jun. 30, 2014
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Jun. 30, 2013
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Sep. 30, 2014
Scenario, Forecast [Member]
Other Pension Plans, Defined Benefit
Sep. 30, 2014
Scenario, Forecast [Member]
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure                
Defined Benefit Plan, Contributions by Employer $ 126 $ 1,000 $ 23 $ 34 $ 6 $ 6 $ 124 $ 250