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Retirement Plans Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Components of Net Periodic Benefit Cost:      
Net actuarial (gain) loss $ 420 $ (393) $ (416)
U.S. Pension Plans      
Components of Net Periodic Benefit Cost:      
Service cost 18 16 31
Interest cost 113 104 122
Expected return on plan assets (229) (191) (181)
Net actuarial (gain) loss (220) 268 387
Amortization of prior service cost (credit) 0 0 0
Curtailment gain 0 0 0
Settlement (gain) loss (16) 11 1
Net periodic benefit cost (credit) $ 334 $ (208) $ (360)
Expense Assumptions:      
Discount rate 3.70% 4.40% 4.35%
Expected return on plan assets 7.50% 7.50% 7.50%
Rate of compensation increase 3.20% 3.25% 3.25%
Non-U.S. Pension      
Components of Net Periodic Benefit Cost:      
Service cost $ 32 $ 30 $ 32
Interest cost 48 44 57
Expected return on plan assets (92) (61) (71)
Net actuarial (gain) loss (195) 237 14
Amortization of prior service cost (credit) 0 1 (1)
Curtailment gain (19) 0 (15)
Settlement (gain) loss (1) 6 0
Net periodic benefit cost (credit) $ 227 $ (257) $ (16)
Expense Assumptions:      
Discount rate 1.90% 3.10% 3.00%
Expected return on plan assets 4.60% 4.50% 4.50%
Rate of compensation increase 2.65% 3.30% 2.60%
Postretirement Benefits      
Components of Net Periodic Benefit Cost:      
Service cost $ 2 $ 2 $ 3
Interest cost 6 6 9
Expected return on plan assets (10) (10) (12)
Net actuarial (gain) loss (5) (2) 21
Amortization of prior service cost (credit) 0 (1) (1)
Curtailment gain 0 0 0
Settlement (gain) loss 0 0 0
Net periodic benefit cost (credit) $ 7 $ 5 $ (20)
Expense Assumptions:      
Discount rate 3.30% 3.75% 4.35%
Expected return on plan assets 5.60% 5.45% 5.75%
Discontinued Operations | U.S. Pension Plans      
Components of Net Periodic Benefit Cost:      
Net periodic benefit cost (credit) $ 0 $ 1 $ 1
Discontinued Operations | Non-U.S. Pension      
Components of Net Periodic Benefit Cost:      
Net periodic benefit cost (credit) 0 111 (1)
Discontinued Operations | Postretirement Benefits      
Components of Net Periodic Benefit Cost:      
Net periodic benefit cost (credit) 0 1 1
Continuing Operations [Member] | U.S. Pension Plans      
Components of Net Periodic Benefit Cost:      
Net periodic benefit cost (credit) 334 (207) (359)
Continuing Operations [Member] | Non-U.S. Pension      
Components of Net Periodic Benefit Cost:      
Service cost 32 30  
Interest cost 48 44  
Net periodic benefit cost (credit) 227 (146) (17)
Continuing Operations [Member] | Postretirement Benefits      
Components of Net Periodic Benefit Cost:      
Net periodic benefit cost (credit) $ 7 $ 6 $ (19)