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Fair Value Measurements Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
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%
Investment Segment [Member]
 
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Change in fair value of loan from 1 percent change in risk premium 3.00%
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 61.00%
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 33.00%
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 6.00%
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 95.00%