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v3.20.4

Leases (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) agreement | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Number Of Land Use Agreements | agreement | 3 |  |
ROU assets, operating leases | $ 535 | $ 499 |
Lease liabilities, operating leases | 541 | 498 |
ROU assets, finance leases | 128 | 62 |
Lease liabilities, finance leases | $ 124 | $ 56 |
Weighted average incremental borrowing rate at the lease inception, operating leases | 3.81% | 3.73% |
Weighted average incremental borrowing rate at the lease inception, finance leases | 3.50% | 3.15% |
Weighted-average remaining lease term, operating leases | 33 years | 31 years |
Weighted-average remaining lease term, finance leases | 25 years | 14 years |
Expected lease payments over the remaining terms of the leases | $ 1,200 |  |
Operating Lease, Expense | 95 | $ 91 |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 121 | 450 |
Net investment in sales-type leases | 47 | $ 50 |
Losses at commencement of sales-type leases |  |  | $ (20)
Expected lease payments over the remaining terms of the power sales agreements | $ 117 |  |
Maximum [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease extension term, operating lease | 20 years |  |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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