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FAIR VALUE MEASUREMENTS (Level 3 Inputs) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of period $ 677 $ 1,237
Gain included in earnings 2 2 0
Purchases 3 0 977
Settlements 3 (445) (551)
Balance at end of period $ 234 $ 1,663