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Disposition of Business (Details) - Opel/Vauxhall Business and Fincos [Member] - Disposal Group [Member] - USD ($)
$ in Millions
 10 Months Ended
Dec. 31, 2017
Mar. 05, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Estimated net consideration for transferred business   $ 2,200
Forecast [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Expected charge at closing $ 4,500  
Charge for deferred tax assets no longer realizable upon transfer 2,700  
De-risking premium payment 400  
Previously deferred pension losses 1,200  
Payment to PSA Group at closing $ 3,200