Discontinued Operations Disposal Group - Assets Held For Sale (Details) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	$ 3,042	$ 3,015
Noncurrent assets held for sale	5,159	5,188
Liabilities held for sale	1,636	1,791
Noncurrent liabilities held for sale	201	207
Power Solutions | Power Solutions | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	17	15
Accounts receivable - net	1,466	1,443
Inventories	1,370	1,405
Other current assets	189	152
Assets held for sale	3,042	3,015
Property, plant and equipment - net	2,900	2,871
Goodwill	1,085	1,092
Other intangible assets - net	156	161
Investments in Partially-Owed Affiliates	463	453
Other noncurrent assets	555	611
Noncurrent assets held for sale	5,159	5,188
Short-term debt	7	9
Current portion of long-term debt	23	25
Accounts payable	1,048	1,237
Accrued compensation and benefits	94	125
Deferred revenue	40	0
Other current liabilities	424	395
Liabilities held for sale	1,636	1,791
Long-term debt	30	31
Pension and postretirement benefits	101	101
Other noncurrent liabilities	70	75
Noncurrent liabilities held for sale	$ 201	$ 207