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Leases - Revenue Related to Leases (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | $ 252 | $ 794 | $ 675
Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | $ 275 | 252 | 794 | 675
Energy revenue |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 163 | 456 | 422
Energy revenue | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 156 | 163 | 456 | 422
Capacity revenue |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 89 | 338 | 253
Capacity revenue | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 119 | 89 | 338 | 253
Conventional Generation |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 91 | 344 | 257
Conventional Generation | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 122 | 91 | 344 | 257
Conventional Generation | Energy revenue |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 2 |  | 4
Conventional Generation | Energy revenue | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 3 | 2 | 6 | 4
Conventional Generation | Capacity revenue |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 89 |  | 253
Conventional Generation | Capacity revenue | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 119 | 89 | 338 | 253
Renewables |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 160 | 449 | 416
Renewables | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 153 | 160 | 449 | 416
Renewables | Energy revenue |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 160 |  | 416
Renewables | Energy revenue | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 153 | 160 | 449 | 416
Renewables | Capacity revenue |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 0 |  | 0
Renewables | Capacity revenue | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 0 | 0 | 0 | 0
Thermal |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 1 | 1 | 2
Thermal | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 0 | 1 | 1 | 2
Thermal | Energy revenue |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 1 |  | 2
Thermal | Energy revenue | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | 0 | 1 | 1 | 2
Thermal | Capacity revenue |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income |  | 0 |  | 0
Thermal | Capacity revenue | Operating Segments |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |
Lease income | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77888421&loc=SL77919311-209978 Reference 3: 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 + Details
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