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Fair Value Measurements Changes in Fair Value Level 3 (Details) - Level 3 - Recurring measurement - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of asset measured on a recurring basis |  | $ 212 | $ 283 | $ 229
Net transfers in (out) |  | (131) | (47) |
Realized and unrealized gains (losses), net | [1] | 10 | 1 |
Change in unrealized gain (loss) of assets measured on a recurring basis |  | 6 | (1) |
Purchases (settlements), net |  | 50 | 100 |
Railcar and Food Packaging |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of asset measured on a recurring basis |  | 9 | 21 | 21
Realized and unrealized gains (losses), net |  | 0 | 0 |
Purchases (settlements), net |  | (12) | 0 |
Non-U.S. Plans | Automotive Segment |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of asset measured on a recurring basis |  | 42 | 40 | 41
Realized and unrealized gains (losses), net |  | 2 | 1 |
Purchases (settlements), net |  | 3 | 6 |
Proceeds from sales |  | (2) | (4) |
Foreign currency exchange rate movements |  | 1 | 4 |
United States Plans | Automotive Segment |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of asset measured on a recurring basis |  | 32 | 86 | $ 91
Realized and unrealized gains (losses), net |  | 0 | (5) |
Purchases (settlements), net |  | 48 | 0 |
Proceeds from sales |  | $ (102) | $ 0 |
[1] | Includes unrealized (losses) gains of $(6) million of $1 million for the years ended December 31, 2016 and 2015, respectively, relating to investments still held at December 31 of each respective period and which are included in net (loss) gain from investment activities in the consolidated statements of operations.

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Foreign Exchange Movements + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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