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Redeemable Noncontrolling Interest (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 36 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Auto Alliance International [Member]
Mar. 31, 2013
Auto Alliance International [Member]
Oct. 01, 2017
Auto Alliance International [Member]
Sep. 01, 2012
Auto Alliance International [Member]
Mar. 31, 2014
Auto Alliance International [Member]
Mazda [Member]
Sep. 01, 2012
Auto Alliance International [Member]
Mazda [Member]
Redeemable Noncontrolling Interest [Line Items]                
Noncontrolling Interest, Ownership Percentage by Parent     50.00%          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners             50.00% 50.00%
Redeemable Non Controlling Interest Exercise Price           $ 339    
Business Acquisition Period Redeemable Noncontrolling Interest Exercised         3 years      
Redeemable Noncontrolling Interest [Roll Forward]                
Beginning balance 331 331 331 322        
Accretion of redemption value of noncontrolling interest     3 2        
Payments     (3) 0        
Ending balance $ 331 $ 331 $ 331 $ 324