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Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Risk premium adjustment assumption to project change in fair value of loan | 1.00% |
Holding Company [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross realized and unrealized losses | $ 32 | $ 0
Investment Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross realized and unrealized losses | 4 | 4
Change in fair value of loan from 1 percent change in risk premium | 2.00% |
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Unrealized losses included in earnings related to Level 3 investments | $ 4 |
Equity investment [Member] | Automotive Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 65.00% |
Defined Benefit Plan, Target Plan Asset Allocations | 50.00% |
Fixed Income Investments [Member] | Automotive Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 20.00% |
Defined Benefit Plan, Target Plan Asset Allocations | 25.00% |
Other Investments [Member] | Automotive Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 15.00% |
Defined Benefit Plan, Target Plan Asset Allocations | 25.00% |
Managed investment funds [Member] | Automotive Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 74.00% |

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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