Long term debt (Tables)

12 Months Ended

Dec. 31, 2019

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt consists of the following (in millions):

	As of December 31,
	2019			2018
First Mortgage Bonds, rates range from 2.51% to 9.31%, with a weighted average rate of 4.63% in 2019 and 5.01% in 2018, due at various dates through 2050	$	2,510		$	2,390
Pollution Control Revenue Bonds, rates at 5%, due 2033	119			119
Pollution Control Revenue Bonds held by PGE	(21		)	(21		)
Total long-term debt	2,608			2,488
Less: Unamortized debt expense	(11		)	(10		)
Less: Current portion of long-term debt	—			(300		)
Long-term debt, net of current portion	$	2,597		$	2,178

Schedule of Maturities of Long-term Debt [Table Text Block]

As of December 31, 2019, the future minimum principal payments on long-term debt are as follows (in millions):

Years ending December 31:
2020	$	—
2021	160
2022	—
2023	—
2024	80
Thereafter	2,368
	$	2,608