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Related Party Transactions (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 29, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
ACF | Railcar component purchases |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses for transactions with related party |  | $ 2 | $ 2 |
ACF | Railcar component sales and royalties |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related Party Transaction, Other Revenues from Transactions with Related Party |  | 0 | 1 |
ACF | Railcar repair services and support |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related Party Transaction, Other Revenues from Transactions with Related Party |  | $ 1 | 1 |
ACF | Purchase of railcars |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses for transactions with related party |  |  | $ 12 |
Mr. Icahn and affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage fair value of investments in Funds that is attributable to Mr. Icahn |  | 69.00% | 69.00% |
Mr. Icahn and affiliates | Investment in funds |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | $ 600 | $ 490 |
Mr. Icahn and affiliates | Investment balance in funds |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, balance |  | 4,200 |  | $ 3,700
Consolidated VIE | Expense sharing arrangement |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 2 | (12) |
Insight Portfolio Group LLC | Buying group operating expenses |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses for transactions with related party |  | $ 1 | $ 1 |
ARL |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity issued to acquire additional interest in consolidated subsidiary (number of units) | 685,367 |  |  |
Percentage of equity ownership in operating subsidiary |  | 100.00% |  |

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