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Amounts in Accumulated Other Comprehensive Income Expected to be Recognized as Components of Net Periodic Benefit Cost over Next Fiscal Year (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Amortization of:      
Net actuarial (gain) loss $ 420 $ (393) $ (416)
Non-U.S. Pension      
Amortization of:      
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
Defined Benefit Plan, Net Periodic Benefit Cost $ (227) $ 257 $ 16
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      
Amortization of:      
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
Defined Benefit Plan, Net Periodic Benefit Cost $ (7) $ (5) $ 20
Discount rate 3.30% 3.75% 4.35%
Expected return on plan assets 5.60% 5.45% 5.75%
U.S. Pension Plans      
Amortization of:      
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
Defined Benefit Plan, Net Periodic Benefit Cost $ (334) $ 208 $ 360
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%
Discontinued Operations | Non-U.S. Pension      
Amortization of:      
Defined Benefit Plan, Net Periodic Benefit Cost $ 0 $ (111) $ 1
Discontinued Operations | Postretirement Benefits      
Amortization of:      
Defined Benefit Plan, Net Periodic Benefit Cost 0 (1) (1)
Discontinued Operations | U.S. Pension Plans      
Amortization of:      
Defined Benefit Plan, Net Periodic Benefit Cost 0 (1) (1)
Continuing Operations [Member] | Non-U.S. Pension      
Amortization of:      
Service cost 32 30  
Interest cost 48 44  
Defined Benefit Plan, Net Periodic Benefit Cost (227) 146 17
Continuing Operations [Member] | Postretirement Benefits      
Amortization of:      
Defined Benefit Plan, Net Periodic Benefit Cost (7) (6) 19
Continuing Operations [Member] | U.S. Pension Plans      
Amortization of:      
Defined Benefit Plan, Net Periodic Benefit Cost $ (334) $ 207 $ 359