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Debt (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt | $ 7,907 | $ 7,918
Reporting Segments |  |
Debt Instrument [Line Items] |  |
Debt | 2,402 | 2,411
Holding Company |  |
Debt Instrument [Line Items] |  |
Debt | 5,505 | 5,507
Automotive Segment |  |
Debt Instrument [Line Items] |  |
Debt | 359 | 340
Energy Segment |  |
Debt Instrument [Line Items] |  |
Debt | 1,168 | 1,166
Railcar Segment |  |
Debt Instrument [Line Items] |  |
Debt | 527 | 546
Metals Segment |  |
Debt Instrument [Line Items] |  |
Debt | 1 | 1
Mining Segment |  |
Debt Instrument [Line Items] |  |
Debt | 53 | 58
Food Packaging Segment |  |
Debt Instrument [Line Items] |  |
Debt | 271 | 273
Real Estate Segment |  |
Debt Instrument [Line Items] |  |
Debt | 19 | 22
Home Fashion Segment |  |
Debt Instrument [Line Items] |  |
Debt | 4 | 5
6.000% senior unsecured notes due 2020 | Holding Company |  |
Debt Instrument [Line Items] |  |
Debt | 1,703 | 1,703
5.875% senior unsecured notes due 2022 | Holding Company |  |
Debt Instrument [Line Items] |  |
Debt | 1,343 | 1,342
6.250% senior unsecured notes due 2022 | Holding Company |  |
Debt Instrument [Line Items] |  |
Debt | 1,214 | 1,216
6.750% senior unsecured notes due 2024 | Holding Company |  |
Debt Instrument [Line Items] |  |
Debt | 498 | 498
6.375% senior unsecured notes due 2025 | Holding Company |  |
Debt Instrument [Line Items] |  |
Debt | $ 747 | $ 748

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