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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Pension Benefits
        
Defined Benefit Plan Disclosure        
Service cost $ 38 $ 34 $ 115 $ 103
Interest cost 117 123 351 368
Expected return on plan assets (107) (109) (321) (327)
Amortization of prior service cost (6) (6) (17) (18)
Recognized net actuarial loss 95 90 283 270
Total net periodic benefit cost recognized 137 132 411 396
Other Post-retirement Benefits
        
Defined Benefit Plan Disclosure        
Service cost 6 5 18 14
Interest cost 8 9 23 27
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (2) (1) (5) (4)
Recognized net actuarial loss 6 8 19 23
Total net periodic benefit cost recognized $ 18 $ 21 $ 55 $ 60