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Leases (Tables) | 6 Months Ended
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Jun. 30, 2019
Leases [Abstract] |
Schedule of Lease Assets and Liabilities - Lessee [Table Text Block] | The following table summarizes the amounts recognized on the Condensed Consolidated Balance Sheets related to lease asset and liability balances as of the period indicated (in millions):
|  | Consolidated Balance Sheet Classification |  | June 30, 2019
Assets |  |  |  |
Right-of-use assets — finance leases |  | Electric generation, distribution assets and other |  | $ | 8 |
Right-of-use assets — operating leases |  | Other noncurrent assets |  | 253 |
Total right-of-use assets |  |  |  | $ | 261 |
Liabilities |  |  |  |
Finance lease liabilities (current) |  | Non-recourse debt (current liabilities) |  | $ | 1 |
Finance lease liabilities (noncurrent) |  | Non-recourse debt (noncurrent liabilities) |  | 9 |
Total finance lease liabilities |  |  |  | 10 |
Operating lease liabilities (current) |  | Accrued and other liabilities |  | 16 |
Operating lease liabilities (noncurrent) |  | Other noncurrent liabilities |  | 263 |
Total operating lease liabilities |  |  |  | 279 |
Total lease liabilities |  |  |  | $ | 289 |
Weighted-Average Lease Term and Discount Rate [Table Text Block] | The following table summarizes supplemental balance sheet information related to leases as of the period indicated:
Lease Term and Discount Rate | June 30, 2019
Weighted-average remaining lease term — finance leases | 15.9 years |
Weighted-average remaining lease term — operating leases | 22.8 years |
Weighted-average discount rate — finance leases | 9.20 | %
Weighted-average discount rate — operating leases | 6.90 | %
Lease, Cost [Table Text Block] | The following table summarizes the components of lease expense recognized in Cost of Sales on the Condensed Consolidated Statements of Operations for the period indicated (in millions):
Components of Lease Cost | Three Months Ended June 30, 2019 |  | Six Months Ended June 30, 2019
Operating lease cost | $ | 14 |  |  | $ | 27 |
Finance lease cost |  |  |
Amortization of right-of-use assets | 1 |  |  | 1 |
Variable and short-term lease costs | 2 |  |  | 3 |
Total lease cost | $ | 17 |  |  | $ | 31 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following table shows the future minimum lease payments under operating and finance leases for continuing operations together with the present value of the net minimum lease payments as of June 30, 2019 for the remainder of 2019 through 2023 and thereafter (in millions):
| Maturity of Lease Liabilities
| Finance Leases |  | Operating Leases
2019 | $ | 1 |  |  | $ | 14 |
2020 | 2 |  |  | 28 |
2021 | 1 |  |  | 26 |
2022 | 1 |  |  | 27 |
2023 | 1 |  |  | 26 |
Thereafter | 10 |  |  | 483 |
Total | 16 |  |  | 604 |
Less: Imputed interest | (6 | ) |  | (325 | )
Present value of total minimum lease payments | $ | 10 |  |  | $ | 279 |
Sales-type Lease, Lease Income [Table Text Block] | The following table shows the future minimum lease receipts as of June 30, 2019 for the remainder of 2019 through 2023 and thereafter (in millions):
| Future Cash Receipts for
| Sales-Type Leases |  | Operating Leases
2019 | $ | 1 |  |  | $ | 256 |
2020 | 2 |  |  | 502 |
2021 | 2 |  |  | 474 |
2022 | 2 |  |  | 459 |
2023 | 2 |  |  | 395 |
Thereafter | 40 |  |  | 1,823 |
Total | 49 |  |  | $ | 3,909 |
Less: Imputed interest | (27 | ) |  |
Present value of total minimum lease receipts | $ | 22 |  |  |

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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=77888426&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=77888426&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=118952077&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=119202524&loc=SL77919372-209981 + Details
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