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Other Income, Net Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]              
Business Combination, Acquisition Related Costs   $ 0 $ 0     $ 5 $ 0
Reserve for Unsecured Creditors Litigation   0 $ 0     0 10
Litigation, Damages Benchmark, Fourth LLP Agreement | Unsecured Creditors Litigation              
Debt Instrument [Line Items]              
Reserve for Unsecured Creditors Litigation       $ 27     $ 10
Litigation Settlement, Amount Awarded to Other Party         $ 310    
Payments for Legal Settlements $ 310            
Powertrain Systems | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Other income (expense), net              
Debt Instrument [Line Items]              
Transition Services Agreement Fees   $ 2       8  
KUM              
Debt Instrument [Line Items]              
Business Combination, Acquisition Related Costs           9  
Not Designated as Hedging Instrument | Korea (South), Won | Foreign exchange forward | KUM              
Debt Instrument [Line Items]              
Derivative, Gain (Loss) on Derivative, Net           $ 4