FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, by Balance Sheet Grouping [Table Text Block]



	March 31, 2019				December 31, 2018
(millions)	Carrying Amount		Estimated Fair Value ⁽¹⁾		Carrying Amount		Estimated Fair Value ⁽¹⁾
Long-term debt ⁽²⁾	$	3,975	$	4,567	$	5,146	$	5,470

⁽¹⁾

Fair value is estimated based on net present value calculations using independently sourced market data that incorporate a developed discount rate using similarly rated long-term debt, along with benchmark interest rates. All fair value measurements are classified as Level 2. The carrying amount of debt issuances with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.


⁽²⁾	Carrying amount includes amounts which represent the unamortized debt issuance costs and discount or premium.