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Related Party Transactions (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 29, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Mr. Icahn and his affiliates [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Investment in funds |  |  |  | $ 498 | $ 246 |
Insight Portfolio Group LLC [Member] | Operating expenses |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses from transactions with related party |  | $ 1 | $ 1 |  | 2 | $ 2
Icahn Capital [Member] | Expense sharing agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses charged by related party |  | 21 | (24) | $ 28 | 204 |
Investment Funds [Member] | Mr. Icahn and his affiliates [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage fair value of investments in Funds that is attributable to Mr. Icahn |  |  |  | 69.00% |  | 55.00%
Investment Funds [Member] | Mr. Icahn and his affiliates [Member] | Investment in Funds [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, balance |  | 4,100 |  | $ 4,100 |  | $ 4,100
ARI [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  | 61.20% |  |
ARI [Member] | ACF [Member] | Railcar Sales [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenues from transactions with related party |  | 0 | 3 | $ 1 | 9 |
ARI [Member] | ACF [Member] | Railcar repair services and support [Member] [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenues from transactions with related party |  | 1 | 0 | 1 | 0 |
ARI [Member] | ACF [Member] | Railcar component sales [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenues from transactions with related party |  | 2 | 4 | $ 4 | 13 |
ARL [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  | 100.00% |  |
ARL [Member] | ACF [Member] | Railcar Sales [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses from transactions with related party |  | $ 0 | $ 16 | $ 14 | 43 |
Railcar Segment [Member] | ARL [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
LP units issued as consideration for acquisition | 685,367 |  |  |  |  |
Agreements with ACF [Member] | ARL [Member] | ACF [Member] | Railcar Sales [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses from transactions with related party |  |  |  | $ 0 | $ 9 |

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