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Benefit Plans Components of Net Periodic Benefit Cost (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Pension Benefits
        
Defined Benefit Plan Disclosure        
Service cost $ 43 $ 34 $ 77 $ 69
Interest cost 111 123 234 245
Expected return on plan assets (105) (109) (214) (218)
Amortization of prior service cost (5) (6) (11) (12)
Recognized net actuarial loss 98 90 188 180
Total net periodic benefit cost recognized 142 132 274 264
Other Post-retirement Benefits
        
Defined Benefit Plan Disclosure        
Service cost 7 4 12 9
Interest cost 6 9 15 18
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (1) (1) (3) (3)
Recognized net actuarial loss 6 8 13 15
Total net periodic benefit cost recognized $ 18 $ 20 $ 37 $ 39