ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

Notes To Financial Statements [Abstract]

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

Pass through costs were as follows (in millions):

	Year Ended December 31,
	2017		2016		2015
Pass through costs	$	59	$	41	$	52

Restricted Fund Balances

Restricted fund balances are as follows (in millions):

	As of December 31,
	2017				2016
	Current		Noncurrent		Current		Noncurrent
Debt service funds - principal	$	10	$	8	$	10	$	7
Debt service funds - interest	—		—		1		—
Total debt service funds	10		8		11		7
Revenue funds	4		—		3		—
Other funds	29		20		42		47
Total	$	43	$	28	$	56	$	54

Property, Plant and Equipment

Property, plant and equipment consisted of the following (in millions):

	As of December 31,
	2017			2016
Land	$	25		$	29
Facilities and equipment	4,312			4,188
Landfills (primarily for ash disposal)	67			63
Construction in progress	54			433
Total	4,458			4,713
Less: accumulated depreciation and amortization	(1,852		)	(1,689		)
Property, plant, and equipment — net	$	2,606		$	3,024

Summary of Asset Retirement Obligation

Our asset retirement obligation is presented as follows (in millions):

	As of December 31,
	2017			2016
Beginning of period asset retirement obligation	$	25		$	30
Accretion expense	2			2
Net change (1)	(1		)	(7		)
End of period asset retirement obligation	26			25
Less: current portion	(2		)	—
Noncurrent asset retirement obligation	$	24		$	25

(1) Comprised primarily of expenditures and settlements of the asset retirement obligation liability, net revisions based on current estimates of the liability and revised expected cash flows and life of the liability

AOCI, Net of Income Taxes

The changes in accumulated other comprehensive (loss) income are as follows (in millions):

	Foreign Currency Translation			Pension and Other Postretirement Plan Unrecognized Net Gain		Net Unrealized Loss on Derivatives			Total
Balance at December 31, 2015	$	(34	)	$	2	$	(2	)	$	(34	)
Other comprehensive loss before reclassifications	(2		)	—		(21		)	(23		)
Amounts reclassified from accumulated other comprehensive loss	(5		)	—		—			(5		)
Net current period comprehensive loss	(7		)	—		(21		)	(28		)
Balance at December 31, 2016	$	(41	)	$	2	$	(23	)	$	(62	)
Net current period comprehensive income (loss)	17			—		(10		)	7
Balance at December 31, 2017	$	(24	)	$	2	$	(33	)	$	(55	)