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Leases Lease Obligations (Tables)
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Lease, Cost [Table Text Block]
The components of lease cost were as follows (in millions):
20232022
Operating lease cost$4 $4 
Finance lease cost:
Amortization of right-of-use assets$14 $14 
Interest on lease liabilities15 15 
Total finance lease cost$29 $29 
Variable lease cost$33 $31 
Lessee, Operating Leases
Supplemental information related to amounts and presentation of leases in the consolidated balance sheets is presented below (in millions):
Balance Sheet ClassificationAs of December 31,
20232022
Operating Leases:
Operating lease right-of-use assetsOther noncurrent assets$18 $22 
Current liabilitiesAccrued expenses and other current liabilities$3 $4 
Noncurrent liabilitiesOther noncurrent liabilities16 18 
Total operating lease liabilities *$19 $22 
Finance Leases:
Finance lease right-of-use assetsElectric utility plant, net$291 $305 
Current liabilitiesCurrent portion of finance lease obligations$20 $20 
Noncurrent liabilitiesFinance lease obligations, net of current portion289 294 
Total finance lease liabilities *$309 $314 
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
As of December 31, 2023, maturities of lease liabilities were as follows (in millions):
Operating LeasesFinance Leases
2024$3 $20 
20251 27 
20261 27 
20271 27 
20281 26 
Thereafter40 356 
Total lease payments47 483 
Less imputed interest(28)(174)
Total$19 $309 
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Supplemental cash flow information related to leases for the years indicated was as follows (in millions):

202320222021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$4 $4 $8 
Operating cash flows from finance leases15 15 11 
Financing cash flows from finance leases6 7 6 
Right-of-use assets obtained in leasing arrangements:
Operating leases$— $— $(12)
Finance leases— 29 153