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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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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)
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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.

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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.

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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.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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