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Benefit Plans Components of Net Periodic Benefit Cost (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Pension Benefits
      
Defined Benefit Plan Disclosure      
Service cost $ 154 $ 139 $ 120
Interest cost 468 490 502
Expected return on plan assets (428) (437) (488)
Amortization of prior service cost (22) (23) (23)
Recognized net actuarial loss 377 361 282
Net periodic benefit cost as acutarially determined 549 530 393
Amount charged (capitlaized) due to actions of regulator 0 0 11
Total net periodic benefit cost 549 530 404
Other Post-retirement Benefits
      
Defined Benefit Plan Disclosure      
Service cost 24 19 13
Interest cost 31 35 32
Expected return on plan assets 0 0 0
Amortization of prior service cost (6) (6) (6)
Recognized net actuarial loss 25 29 22
Net periodic benefit cost as acutarially determined 74 77 61
Amount charged (capitlaized) due to actions of regulator 0 0 0
Total net periodic benefit cost $ 74 $ 77 $ 61