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Benefit Plans Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plan, Funded Status of Plan [Abstract]      
Amount of defined benefit plan actuarial gain (loss) from change in COLA $ 232    
Pension Benefits      
Change in benefit obligation      
Benefit obligation 12,824 $ 12,265 $ 11,471
Service cost 130 130 154
Interest cost 540 558 468
Plan participants' contributions 25 28  
Amendments 0 2  
Actuarial loss (gain) 556 722  
Net transfers from variable fund/401(k) plan 11 13  
Expenses paid (6) (6)  
Benefits paid (697) (653)  
Amount of defined benefit plan actuarial gain (loss) from change in mortality assumption 518    
Change in plan assets      
Fair value of net plan assets 6,797 7,507 $ 7,221
Actual return on plan assets (325) 648  
Employer contributions [1] 282 256  
Defined Benefit Plan, Funded Status of Plan [Abstract]      
Funded status $ (6,027) $ (4,758)  
Discount rate 4.50% 4.45% 5.00%
Amount of defined benefit plan actuarial gain (loss) from discount rate change $ 79 $ (729)  
Amount of defined benefit plan actuarial gain (loss) from reduction in workforce (36)    
Amount of defined benefit plan actuarial gain (loss) from plan demographic experience changes 349    
Amount of defined benefit plan actuarial gain (loss) from retirement rate assumption change 88    
Other Post-retirement Benefits      
Change in benefit obligation      
Benefit obligation 657 652 $ 656
Service cost 16 18 24
Interest cost 29 32 31
Collections [2] 94 93  
Amendments 0 0  
Actuarial loss (gain) 3 (21)  
Net transfers from variable fund/401(k) plan 0 0  
Expenses paid 0 0  
Benefits paid (137) (126)  
Amount of defined benefit plan actuarial gain (loss) from change in mortality assumption 21    
Change in plan assets      
Fair value of net plan assets 0 0 $ 0
Actual return on plan assets 0 0  
Employer contributions [1] 43 33  
Defined Benefit Plan, Funded Status of Plan [Abstract]      
Funded status $ (657) $ (652)  
Discount rate 4.65% 4.50% 5.05%
Amount of defined benefit plan actuarial gain (loss) from discount rate change $ 13 $ 43  
Amount of defined benefit plan actuarial gain (loss) from reduction in workforce   (17)  
Amount of defined benefit plan actuarial gain (loss) from plan demographic experience changes 20 (64)  
Amount of defined benefit plan actuarial gain (loss) from updated capita claims costs and retiree contributions $ 30    
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.