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Fair Value Measurements Changes in Fair Value Level 3 (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Investment Segment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |
Balance at January 1 | $ 288 | $ 289
Gross realized and unrealized gains | (4) | (4)
Gross proceeds | (5) | (5)
Balance at December 31 | 287 | 288
Holding Company [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |
Balance at January 1 | 81 | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 67 | 0
Transfer in | 0 | 81
Gross realized and unrealized gains | (32) | 0
Balance at December 31 | 116 | 81
Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Railcar and Food Packaging [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |
Balance at January 1 | 30 | 27
Realized/unrealized gains (losses), net | 3 | 3
Purchases and settlements, net | (12) | 0
Balance at December 31 | 21 | 30
Fair Value, Inputs, Level 3 [Member] | United States Plans | Recurring measurement [Member] | Automotive Segment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |
Balance at January 1 | 14 | 0
Realized/unrealized gains (losses), net | 11 | 2
Purchases and settlements, net | 83 | 12
Gross proceeds | (23) | 0
Balance at December 31 | 85 | 14
Fair Value, Inputs, Level 3 [Member] | Non-U.S. Plans | Recurring measurement [Member] | Automotive Segment [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward] |  |
Balance at January 1 | 42 | 35
Realized/unrealized gains (losses), net | 1 | 1
Purchases and settlements, net | 6 | 7
Gross proceeds | (6) | (2)
Foreign currency exchange rate movements | 1 | 1
Balance at December 31 | $ 44 | $ 42

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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 Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Net Realized And Unrealized Gains Losses + References No definition available. + 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=25499696&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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) 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 -URI http://asc.fasb.org/extlink&oid=25499696&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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + 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)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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