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Benefit Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Benefits        
Defined Benefit Plan Disclosure        
Service cost $ 32 $ 33 $ 97 $ 98
Interest cost 135 139 405 418
Expected return on plan assets (110) (109) (328) (326)
Amortization of prior service cost (5) (5) (16) (16)
Recognized net actuarial loss 75 71 225 214
Total net periodic benefit cost as actuarially determined 127 129 383 388
Amount capitalized due to actions of regulator (57) 0 (171) 0
Total net periodic benefit cost 70 129 212 388
Other Post-retirement Benefits        
Defined Benefit Plan Disclosure        
Service cost 4 5 12 14
Interest cost 7 8 22 24
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (2) (2) (5) (5)
Recognized net actuarial loss 3 3 7 8
Total net periodic benefit cost as actuarially determined 12 14 36 41
Amount capitalized due to actions of regulator 0 0 0 0
Total net periodic benefit cost $ 12 $ 14 $ 36 $ 41