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Benefit Plans Components of Net Periodic Benefit Cost (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Pension Benefits
      
Defined Benefit Plan Disclosure      
Service cost $ 130 $ 154 $ 139
Interest cost 558 468 490
Expected return on plan assets (435) (428) (437)
Amortization of prior service credit (21) (22) (23)
Recognized net actuarial loss 285 377 361
Total net periodic benefit cost 517 549 530
Other Post-retirement Benefits
      
Defined Benefit Plan Disclosure      
Service cost 18 24 19
Interest cost 32 31 35
Expected return on plan assets 0 0 0
Amortization of prior service credit (6) (6) (6)
Recognized net actuarial loss 11 25 29
Total net periodic benefit cost $ 55 $ 74 $ 77