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FAIR VALUE MEASUREMENTS Summary of Level 3 Inputs (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of period $ 1,684 $ 1,149 $ 1,237 $ 943
Loss included in earnings (15) 0 (17) (1)
Purchases 305 480 1,558 1,440
Settlements (135) (129) (939) (882)
Balance at end of period $ 1,839 $ 1,500 $ 1,839 $ 1,500