FAIR VALUE OF FINANCIAL INSTRUMENTS Estimated Fair Values and Carrying Values of Long-Term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term debt, including current maturities	$ 5,995	$ 6,610
Fair Value, Inputs, Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term debt, fair value	7,097	7,475
Fixed interest rate
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term debt, including current maturities	5,771	6,061
Fixed interest rate | Fair Value, Inputs, Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term debt, fair value	6,872	6,925
Variable interest rate
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term debt, including current maturities	224	549
Variable interest rate | Fair Value, Inputs, Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]
Long-term debt, fair value	$ 225	$ 550