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Benefit Plans Components of Net Periodic Benefit Cost (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits
    
Defined Benefit Plan Disclosure    
Service cost $ 34 $ 35
Interest cost 123 122
Expected return on plan assets (109) (109)
Amortization of prior service cost (6) (6)
Recognized net actuarial loss 90 90
Total net periodic benefit cost recognized 132 132
Other Post-retirement Benefits
    
Defined Benefit Plan Disclosure    
Service cost 5 5
Interest cost 9 9
Expected return on plan assets 0 0
Amortization of prior service cost (2) (2)
Recognized net actuarial loss 7 7
Total net periodic benefit cost recognized $ 19 $ 19