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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following table shows the future lease payments under operating and finance leases for continuing operations together with the present value of the net lease payments as of December 31, 2020 for 2021 through 2025 and thereafter (in millions):
| Maturity of Lease Liabilities
| Finance Leases |  | Operating Leases
2021 | $ | 5 |  |  | $ | 29 |
2022 | 5 |  |  | 29 |
2023 | 5 |  |  | 28 |
2024 | 4 |  |  | 27 |
2025 | 4 |  |  | 25 |
Thereafter | 134 |  |  | 507 |
Total | 157 |  |  | 645 |
Less: Imputed interest | (76) |  |  | (335) |
Present value of lease payments | $ | 81 |  |  | $ | 310 |
Schedule of Lease Assets and Liabilities - Lessee [Table Text Block] | The following table summarizes the amounts recognized on the Consolidated Balance Sheets related to lease asset and liability balances as of the periods indicated (in millions):
|  | Consolidated Balance Sheet Classification |  | December 31, 2020 |  |  | December 31, 2019
Assets |  |  |  |  |  |  |
Right-of-use assets — finance leases |  | Electric generation, distribution assets and other |  | $ | 74 |  |  |  | $ | 67 |
Right-of-use assets — operating leases |  | Other noncurrent assets |  | 275 |  |  |  | 248 |
Total right-of-use assets |  |  |  | $ | 349 |  |  |  | $ | 315 |
Liabilities |  |  |  |  |  |  |
Finance lease liabilities (current) |  | Non-recourse debt (current liabilities) |  | $ | 4 |  |  |  | $ | 3 |
Finance lease liabilities (noncurrent) |  | Non-recourse debt (noncurrent liabilities) |  | 77 |  |  |  | 67 |
Total finance lease liabilities |  |  |  | 81 |  |  |  | 70 |
Operating lease liabilities (current) |  | Accrued and other liabilities |  | 17 |  |  |  | 16 |
Operating lease liabilities (noncurrent) |  | Other noncurrent liabilities |  | 293 |  |  |  | 261 |
Total operating lease liabilities |  |  |  | 310 |  |  |  | 277 |
Total lease liabilities |  |  |  | $ | 391 |  |  |  | $ | 347 |
Weighted-Average Lease Term and Discount Rate [Table Text Block] | The following table summarizes supplemental balance sheet information related to leases as of the periods indicated:
Lease Term and Discount Rate | December 31, 2020 |  | December 31, 2019
Weighted-average remaining lease term — finance leases | 31 years |  | 32 years
Weighted-average remaining lease term — operating leases | 23 years |  | 23 years
Weighted-average discount rate — finance leases | 4.11 | % |  | 4.99 | %
Weighted-average discount rate — operating leases | 6.81 | % |  | 6.99 | %
Lease, Cost [Table Text Block] | The following table summarizes the components of lease expense recognized in Cost of Sales on the Consolidated Statements of Operations for the years ended (in millions):
| Twelve Months Ended December 31, |  |
Components of Lease Cost | 2020 |  | 2019 |  |
Operating lease cost | $ | 36 |  |  | $ | 46 |  |  |
Finance lease cost: |  |  |  |  |
Amortization of right-of-use assets | 3 |  |  | 2 |  |  |
Interest on lease liabilities | 4 |  |  | 2 |  |  |
Short-term lease costs | 13 |  |  | 38 |  |  |
Variable lease cost | — |  |  | 1 |  |  |
Total lease cost | $ | 56 |  |  | $ | 89 |  |  |
Sales-type Lease, Lease Income [Table Text Block] | The following table shows the future lease receipts as of December 31, 2020 for 2021 through 2025 and thereafter (in millions):
| Future Cash Receipts for
| Sales-Type Leases |  | Operating Leases
2021 | $ | 2 |  |  | $ | 489 |
2022 | 2 |  |  | 475 |
2023 | 3 |  |  | 411 |
2024 | 3 |  |  | 412 |
2025 | 3 |  |  | 412 |
Thereafter | 39 |  |  | 1,034 |
Total | 52 |  |  | $ | 3,233 |
Less: Imputed interest | (24) |  |  |
Present value of total lease receipts | $ | 28 |  |  |

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- Definition Schedule of Lease Assets and Liabilities - Lessee [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of components of income from sales-type lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=121640914&loc=SL77927221-108306 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919372-209981 + Details
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