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Benefit Plans Components of Net Periodic Benefit Cost (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension Benefits
        
Defined Benefit Plan Disclosure        
Service cost $ 33 $ 38 $ 98 $ 115
Interest cost 139 117 418 351
Expected return on plan assets (109) (107) (326) (321)
Amortization of prior service cost (5) (6) (16) (17)
Recognized net actuarial loss 71 95 214 283
Total net periodic benefit cost recognized 129 137 388 411
Other Post-retirement Benefits
        
Defined Benefit Plan Disclosure        
Service cost 5 6 14 18
Interest cost 8 8 24 23
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (2) (2) (5) (5)
Recognized net actuarial loss 3 6 8 19
Total net periodic benefit cost recognized $ 14 $ 18 $ 41 $ 55