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Goodwill and Other Intangibles - Schedule of Amortization and Retirement of Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Total amortization | $ 204 | $ 151 | $ 133
Depreciation and amortization | 435 | 373 | 421
Renewables Energy Certificates | Cost of operations |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible asset retirements | 36 | 17 | 28
Emission Allowances |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total amortization | 28 | 32 | 39
Customer Relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total amortization | 74 | 44 | 32
Marketing Partnerships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total amortization | 24 | 15 | 9
Trade Names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total amortization | 27 | 25 | 23
Other(b) |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total amortization | 51 | 35 | 30
Depreciation and amortization | $ 15 | $ 18 | $ 2

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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=121586364&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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- Definition The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount 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=121586364&loc=d3e3602-108585 + Details
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