XML 29 R77.htm IDEA: XBRL DOCUMENT v3.2.0.727
Benefit Plans Contributions (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure          
Defined Benefit Plan, Contributions by Employer   $ 138     $ 250
Other Post-retirement Benefits          
Defined Benefit Plan Disclosure          
Defined Benefit Plan, Contributions by Employer   31 $ 23    
Supplemental Employee Retirement Plan          
Defined Benefit Plan Disclosure          
Defined Benefit Plan, Contributions by Employer   $ 7 $ 6    
Scenario, Forecast [Member] | Other Pension Plans, Defined Benefit          
Defined Benefit Plan Disclosure          
Defined Benefit Plan, Contributions by Employer $ 137     $ 275