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STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Translation Adjustment $ (374)   $ (381) $ (284)
Change in cumulative translation adjustment 7 $ 106 (97)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax (7)   34  
Benefit Plans Unrecognized Prior Service Credits 156   163 129
Amortization of unrecognized prior service credits included in net periodic costs [1] (7) (7)    
Unrealized Gains (Losses) on Derivative Instruments (87)   (62) (234)
Change in Unrealized Gains (Losses) on Derivative Instruments (25)   172  
Unrealized Losses on Investments (1)   (1) (1)
Change in Unrealized Losses on Investments 0   0  
Accumulated Other Comprehensive Income (Loss), Net of Tax (306)   (281) $ (390)
Total other comprehensive income (loss), net of tax $ (25) $ 85 $ 109  
[1] Included in the calculation of net periodic benefit costs for pension and other postretirement benefit plans. See Note 7, "Retirement Plans".