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Related Party Transactions (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |
Investments in subsidiaries prior to acquiring a controlling interest |  | $ 0 | $ 0 | $ 286
Mr. Icahn and affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity issued to acquire additional interest in consolidated subsidiary (number of units) | 685,367 |  |  |
Investments in subsidiaries prior to acquiring a controlling interest | $ 35 |  |  |
Percentage of equity ownership in subsidiary |  |  | 100.00% |
Investment in funds | Mr. Icahn and affiliates |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 310 | $ 600 | 498
Related party transaction, balance |  | $ 5,000 | $ 4,400 |
Percentage fair value of investments in Funds that is attributable to Mr. Icahn |  | 50.00% | 59.00% |
Expense sharing arrangement | Consolidated VIE |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | $ 12 | $ 13 | 34
Repair services revenue from related party | Hertz |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 40 | 17 | 3
Purchases from related party | Hertz |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 1 | 2 | 2
Purchases from related party | ACF |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 3 | 6 | 21
Sales to related party | ACF |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 6 | 1 | 1
Buying group operating expenses | Insight Portfolio Group LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 4 | $ 2 | $ 2
Investment | Purchases from related party | Hertz |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount of transaction with related party |  | 36 |  |
Automotive Segment | 767 Leasing |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Variable Interest Entity, Nonconsolidated, assets at VIE |  | 60 |  |
Variable Interest Entity, Nonconsolidated, liabilities at VIE |  | 1 |  |
investment in nonconsolidated VIE |  | 60 |  |
investment in related parties |  | $ 59 |  |

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