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STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Translation Adjustment $ (178)   $ (284) $ (68)
Change in cumulative translation adjustment 106 $ (212) (216)  
Benefit Plans Unrecognized Prior Service Credits 122   129 61
Amortization of unrecognized prior service credits included in net periodic costs (7) [1] (4) [1] 68  
Unrealized Gains (Losses) on Derivative Instruments (248)   (234) (269)
Change in Unrealized Gains (Losses) on Derivative Instruments (14) [2] 52 [2] 35  
Unrealized Losses on Investments (1)   (1) (1)
Change in Unrealized Losses on Investments 0   0  
Accumulated Other Comprehensive Income (Loss), Net of Tax (305)   (390) $ (277)
Total other comprehensive income (loss), net of tax $ 85 $ (164) $ (113)  
[1] Included in the calculation of net periodic benefit costs for pension and other postretirement benefit plans. See Note 8, "Retirement Plans".
[2] For additional information regarding the impact of reclassifications into earnings, refer to Note 7, "Derivatives".