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Benefit Plans Obligations and Funded Status (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2013
Pension Benefits
Sep. 30, 2012
Pension Benefits
Sep. 30, 2011
Pension Benefits
Sep. 30, 2014
Other Post-retirement Benefits
Sep. 30, 2013
Other Post-retirement Benefits
Sep. 30, 2012
Other Post-retirement Benefits
Sep. 30, 2011
Other Post-retirement Benefits
Change in benefit obligation                      
Benefit obligation         $ 11,471 $ 11,995 $ 11,255   $ 656 $ 811 $ 800
Service cost         154 139 120   24 19 13
Interest cost         468 490 502   31 35 32
Plan participants' contributions         29 30     79 80  
Amendments         4 3     0 0  
Actuarial loss (gain)         (549) 686     (163) (2)  
Net transfers from variable fund/401(k) plan         4 7     0 0  
Expenses paid         (6) (5)     0 0  
Benefits paid         (628) (610)     (126) (121)  
Change in plan assets                      
Fair value of net plan assets         7,221 7,029 6,546   0 0 0
Actual return on plan assets         787 1,053     0 0  
Employer contributions         6 8   40 47 41  
Defined Benefit Plan, Funded Status of Plan [Abstract]                      
Funded status         (4,250) (4,966)     (656) (811)  
Discount rate   4.00% 4.50%   5.00% 4.00% 4.50%   5.05% 4.00%  
Amount of defined benefit plan actuarial gain (loss) from discount rate change         (1,400) 683     (93) (49)  
Impact of previously excluded retiree benefits 705                    
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                 43    
Pension and Other Postretirement Benefit Plan Partcipation Rate   85.00% 90.00%                
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 8.00% 8.50% 8.00% 8.00%         8.00% 8.50% 8.00%
Amount of defined benefit plan actuarial gain (loss) from health care cost trend rate change                   46  
Change in accumulated postretirement benefit obligation   $ 11