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Related Party Transactions (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 29, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Mr. Icahn and his affiliates [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Investment in funds |  | $ 490 | $ 245 |
Icahn Capital [Member] | Expense sharing agreement [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses charged by related party |  | $ (12) | 98 |
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
ARI [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of equity ownership in subsidiary |  | 60.70% |  |
ARI [Member] | ACF [Member] | Railcar Sales [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from transactions with related party |  | $ 1 | 2 |
ARI [Member] | ACF [Member] | Railcar component sales [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues from transactions with related party |  | 2 | 3 |
ARL [Member] | ACF [Member] | Railcar Sales [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related party |  | $ 12 | 5 |
Railcar Segment [Member] | ARL [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Subsidiary units issued as partial 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 |  |  | $ 9 |

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