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Goodwill and Other Intangibles - Components of Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at beginning of period | $ 2,025 | $ 2,051
Purchases | 348 | 70
Acquisition of businesses | 2,352 | 22
Usage/Sales/Retirements | (365) | (35)
Write-off of fully amortized balances | (216) | (74)
Impairment |  | (14)
Other | 3 | 5
Balance at end of period | 4,147 | 2,025
Less accumulated amortization | (1,636) | (1,357)
Net carrying amount | 2,511 | 668
Renewable Energy Program |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Carrying value | 123 | 28
Emission Allowances |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at beginning of period | 672 | 662
Purchases | 10 | 25
Acquisition of businesses | 0 | 0
Usage/Sales/Retirements | (1) | 0
Write-off of fully amortized balances | (51) | (4)
Impairment |  | (14)
Other | 4 | 3
Balance at end of period | 634 | 672
Less accumulated amortization | (536) | (563)
Net carrying amount | 98 | 109
Customer and Supply Contracts |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at beginning of period | 28 | 28
Purchases | 0 | 0
Acquisition of businesses | 610 | 0
Usage/Sales/Retirements | 0 | 0
Write-off of fully amortized balances | 0 | 0
Impairment |  | 0
Other | 0 | 0
Balance at end of period | 638 | 28
Less accumulated amortization | (94) | (28)
Net carrying amount | 544 | 0
Customer Relationships |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at beginning of period | 527 | 573
Purchases | 0 | 0
Acquisition of businesses | 1,308 | 22
Usage/Sales/Retirements | 0 | 0
Write-off of fully amortized balances | (158) | (70)
Impairment |  | 0
Other | 2 | 2
Balance at end of period | 1,679 | 527
Less accumulated amortization | (518) | (349)
Net carrying amount | $ 1,161 | $ 178
Weighted average useful life, years | 12 years | 5 years
Marketing Partnerships |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at beginning of period | $ 285 | $ 285
Purchases | 0 | 0
Acquisition of businesses | 0 | 0
Usage/Sales/Retirements | 0 | 0
Write-off of fully amortized balances | 0 | 0
Impairment |  | 0
Other | (1) | 0
Balance at end of period | 284 | 285
Less accumulated amortization | (123) | (99)
Net carrying amount | 161 | 186
Trade Names |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at beginning of period | 373 | 373
Purchases | 0 | 0
Acquisition of businesses | 310 | 0
Usage/Sales/Retirements | 0 | 0
Write-off of fully amortized balances | 0 | 0
Impairment |  | 0
Other | 0 | 0
Balance at end of period | 683 | 373
Less accumulated amortization | (294) | (247)
Net carrying amount | 389 | 126
Other |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Balance at beginning of period | 140 | 130
Purchases | 338 | 45
Acquisition of businesses | 124 | 0
Usage/Sales/Retirements | (364) | (35)
Write-off of fully amortized balances | (7) | 0
Impairment |  | 0
Other | (2) | 0
Balance at end of period | 229 | 140
Less accumulated amortization | (71) | (71)
Net carrying amount | $ 158 | $ 69

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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