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COMMITMENTS AND CONTINGENCIES 8 (Details) - United Auto Workers [Member]
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Pre-2003 Retirees [Member]  
Other Matters Paragraph Details [Line Items]  
Potential Opeb Increase Due To Adverse Ruling $ 129
Post-2003 Retirees [Member]  
Other Matters Paragraph Details [Line Items]  
Potential Opeb Increase Due To Adverse Ruling $ 95