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Subsequent Events (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2017 $ / shares | Aug. 02, 2017 $ / shares | May 03, 2017 $ / shares | Feb. 27, 2017 $ / shares | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Oct. 31, 2017 USD ($) | Dec. 19, 2016 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distribution declared per LP unit | $ / shares |  | $ 1.50 | $ 1.50 | $ 1.50 |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  | $ 105,000,000 | $ 1,045,000,000 |  |
Proceeds from disposition of assets |  |  |  |  |  |  |  | 1,461,000,000 | 20,000,000 |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  | $ 446,000,000 | $ (1,000,000) | 1,966,000,000 | 10,000,000 |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distribution declared per LP unit | $ / shares | $ 1.50 |  |  |  |  |  |  |  |  |  |
Automotive Segment |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  | 1,000,000 | (1,000,000) | 4,000,000 | 8,000,000 |  |
Automotive Segment | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 120,000,000 |  |  |  |  |  |
Railcar Segment |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated number of railcars to be disposed of (number of railcars) |  |  |  |  |  |  |  |  |  |  | 29,000
Gain (loss) on disposition of assets, net |  |  |  |  |  | $ (10,000,000) | $ 1,000,000 | $ 1,511,000,000 | $ 1,000,000 |  |
Railcar Segment | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated number of railcars to be disposed of (number of railcars) |  |  |  |  |  |  |  |  |  | 4,382 |
Proceeds from disposition of assets |  |  |  |  | 522,000,000 |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  | $ 154,000,000 |  |  |  |  |  |

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- Definition Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 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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