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Benefit Plans Sensitivity to Changes in Assumed Health Care Cost Trend Rates (Details)
$ in Millions
12 Months Ended
Sep. 30, 2015
USD ($)
Defined Benefit Plan Disclosure  
Effect of one percentage point increase on total service and interest cost components $ 6
Effect of one percentage point decrease on total service and interest cost components (6)
Effect of one percentage point increase on end-of-year accumulated postretirement benefit obligation 88
Effect of one percentage point decrease on end-of-year accumulated postretirement benefit obligation $ (94)