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FINANCIAL INSTRUMENTS - Summary of Activity in Accumulated Other Comprehensive Income Related to Derivatives (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Before-Tax Amount    
Accumulated derivative net losses, beginning of period $ (23) $ 1
Net changes in fair value of derivatives (64) 25
Net losses reclassified from accumulated other comprehensive income into income 43 (33)
Accumulated derivative net losses, end of period (44) (7)
Income Tax    
Accumulated derivative net losses, beginning of period 1 0
Net changes in fair value of derivatives 10 (1)
Reclassification from AOCI, Current Period, Tax (6) 4
Accumulated derivative net losses, end of period 5 3
After-Tax Amount    
Accumulated derivative net losses, beginning of period (22) 1
Net changes in fair value of derivatives (54) 24
Net losses reclassified from accumulated other comprehensive income into income 37 (29)
Accumulated derivative net losses, end of period $ (39) $ (4)