Leases Lease Obligations (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Lease, Cost [Table Text Block]

The components of lease cost were as follows (in millions):

	2020		2019
Operating lease cost	$	8	$	7
Finance lease cost:
Amortization of right-of-use assets	$	5	$	3
Interest on lease liabilities	10		6
Total finance lease cost	$	15	$	9
Variable lease cost	$	12	$	19

Lease term and discount rates were as follows:

	December 31, 2020		December 31, 2019
Weighted Average Remaining Lease Term (in years)
Operating leases	26		24
Finance leases	28		29
Weighted Average Discount Rate
Operating leases	3.6	%	3.5	%
Finance leases	7.3	%	7.3	%

Leases of Lessee Disclosure [Text Block]

Supplemental information related to amounts and presentation of leases in the consolidated balance sheets is presented below (in millions):

	Balance Sheet Classification	December 31, 2020		December 31, 2019
Operating Leases:
Operating lease right-of-use assets	Other noncurrent assets	$	44	$	51
Current liabilities	Accrued expenses and other current liabilities	$	8	$	8
Noncurrent liabilities	Other noncurrent liabilities	36		43
Total operating lease liabilities*		$	44	$	51
Finance Leases:
Finance lease right-of-use assets	Electric utility plant, net	$	145	$	150
Current liabilities	Current portion of finance lease obligations	$	16	$	16
Noncurrent liabilities	Finance lease obligations, net of current portion	129		135
Total finance lease liabilities		$	145	$	151

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

As of December 31, 2020, maturities of lease liabilities were as follows (in millions):

	Operating Leases		Finance Leases
2021	$	8	$	16
2022	8		16
2023	8		14
2024	7		14
2025	1		13
Thereafter	45		222
Total lease payments	77		295
Less imputed interest	(33)		(150)
Total	$	44	$	145

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

Supplemental cash flow information related to leases was as follows (in millions):

	December 31, 2020		December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	8	$	7
Operating cash flows from finance leases	10		5
Financing cash flows from finance leases	6		4
Right-of-use assets obtained in leasing arrangements:
Operating leases	$	—	$	56
Finance leases	—		154