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Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net | $ 1,290,000,000 | $ 1,457,000,000 |
Accumulated amortization | 297,000,000 | 228,000,000 |
Amortization of intangible assets | 95,000,000 | 102,000,000 | $ 99,000,000
Amortization expense, 2020 | 95,000,000 |  |
Amortization expense, 2021 | 95,000,000 |  |
Amortization expense, 2022 | 95,000,000 |  |
Amortization expense, 2023 | 95,000,000 |  |
Amortization expense, 2024 | 95,000,000 |  |
Impairment charges | 0 | 0 |
Net non-utility plant | 48,596,000,000 | 46,555,000,000 |
Intangible assets | 1,293,000,000 | 1,460,000,000 |
Long-term debt | 23,044,000,000 | 22,349,000,000 |
Power Purchase Agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | 288,000,000 | 220,000,000 |
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net | 3,000,000 | 3,000,000 |
Accumulated amortization | $ 9,000,000 | $ 8,000,000 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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