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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%