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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Deferred tax asset from stock options exercised and restricted stock vestings |  | $ 179 |  |  |  |  |
Stock repurchase program, authorized amount |  | $ 1,000 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 49 |  | $ 119 |  | $ 199 | $ 119 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 1,100 |  |  |  | 1,100 |  |
Post Merger Stock Repurchase Program [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 1,000
Parent |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stockholder's equity, spin-off of Adient | 0 |  | (18) | $ (4,020) | 0 | 4,038 |
Treasury Stock, Value, Acquired, Cost Method | $ 49 |  | $ 119 |  | $ 199 | $ 119 |

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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