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Redeemable Noncontrolling Interest (Details) (USD $)
In Millions, unless otherwise specified
4 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Sep. 01, 2018
Redeemable Noncontrolling Interest [Roll Forward]      
Ending balance $ 322 $ 331  
Auto Alliance International [Member]
     
Redeemable Noncontrolling Interest [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent   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 319 322  
Accretion of redemption value of noncontrolling interest 3 9  
Ending balance $ 322 $ 331  
Auto Alliance International [Member] | Mazda [Member]
     
Redeemable Noncontrolling Interest [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   50.00%