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Benefit Plans Obligations and Funded Status (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Pension Benefits
      
Change in benefit obligation      
Benefit obligation $ 12,265 $ 11,471 $ 11,995
Service cost 130 154 139
Interest cost 558 468 490
Plan participants' contributions 28 29  
Amendments 2 4  
Actuarial loss (gain) (722) 549  
Net transfers from variable fund/401(k) plan 13 4  
Expenses paid (6) (6)  
Benefits paid (653) (628)  
Change in plan assets      
Fair value of net plan assets 7,507 7,221 7,029
Actual return on plan assets 648 787  
Employer contributions 256 [1] 6 [1]  
Defined Benefit Plan, Funded Status of Plan [Abstract]      
Funded status (4,758) (4,250)  
Discount rate 4.45% 5.00% 4.00%
Amount of defined benefit plan actuarial gain (loss) from discount rate change (729) 1,400  
Amount of defined benefit plan actuarial gain (loss) from reduction in workforce (36)    
Impact of previously excluded retiree benefits   (705)  
Amount of defined benefit plan actuarial gain (loss) from retirement rate assumption change 88    
Other Post-retirement Benefits
      
Change in benefit obligation      
Benefit obligation 652 656 811
Service cost 18 24 19
Interest cost 32 31 35
Collections 93 [2] 79 [2]  
Amendments 0 0  
Actuarial loss (gain) 21 163  
Net transfers from variable fund/401(k) plan 0 0  
Expenses paid 0 0  
Benefits paid (126) (126)  
Change in plan assets      
Fair value of net plan assets 0 0 0
Actual return on plan assets 0 0  
Employer contributions 33 [1] 47 [1]  
Defined Benefit Plan, Funded Status of Plan [Abstract]      
Funded status (652) (656)  
Discount rate 4.50% 5.05% 4.00%
Amount of defined benefit plan actuarial gain (loss) from discount rate change (43) 93  
Amount of defined benefit plan actuarial gain (loss) from reduction in workforce (17)    
Amount of defined benefit plan actuarial gain (loss) from excise tax change   (33)  
Amount of defined benefit plan actuarial gain (loss) from plan demographic experience changes 64 43  
Amount of defined benefit plan actuarial gain (loss) from retirement rate assumption change $ 16    
[1] Other Post-Retirement Benefits Employer contributions are reduced by federal reinsurance payments and provider discounts and rebates.
[2] Collections include retiree contributions as well as federal reinsurance payments and provider discounts and rebates.