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Acquisitions and Dispositions - Purchase Price Allocation (Details) - USD ($) $ in Millions | Jan. 25, 2021 | Sep. 30, 2021 | Jan. 05, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Other Assets |  |  |  |
Goodwill |  | $ 1,801 |  | $ 579
Direct Energy |  |  |  |
Current Assets |  |  |  |
Cash and cash equivalents |  |  | $ 152 |
Funds deposited by counterparties |  |  | 21 |
Restricted cash |  |  | 9 |
Accounts receivable, net |  |  | 1,802 |
Inventory |  |  | 106 |
Derivative instruments |  |  | 1,014 |
Cash collateral paid in support of energy risk management activities |  |  | 233 |
Prepayments and other current assets |  |  | 183 |
Total current assets |  |  | 3,520 |
Property, plant and equipment, net |  |  | 151 |
Other Assets |  |  |  |
Goodwill |  |  | 1,257 |
Intangible assets, net |  |  | 2,321 |
Derivative instruments |  |  | 531 |
Other non-current assets |  |  | 31 |
Total other assets |  |  | 4,140 |
Total Assets |  |  | 7,811 |
Current Liabilities |  |  |  |
Accounts payable |  |  | 1,120 |
Derivative instruments |  |  | 1,266 |
Cash collateral received in support of energy risk management activities |  |  | 21 |
Accrued expenses and other current liabilities |  |  | 690 |
Total current liabilities |  |  | 3,097 |
Other Liabilities |  |  |  |
Derivative instruments |  |  | 562 |
Deferred income taxes |  |  | 338 |
Other non-current liabilities |  |  | 115 |
Total other liabilities |  |  | 1,015 |
Total Liabilities |  |  | 4,112 |
Direct Energy Purchase Price |  |  | 3,699 |
Goodwill, expected to be tax deductible |  |  | 337 |
Direct Energy | Texas |  |  |  |
Other Assets |  |  |  |
Goodwill |  |  | 424 |
Direct Energy | East |  |  |  |
Other Assets |  |  |  |
Goodwill |  |  | 663 |
Direct Energy | West/Services/Other |  |  |  |
Other Assets |  |  |  |
Goodwill |  |  | 170 |
Direct Energy | Customer relationships |  |  |  |
Other Assets |  |  |  |
Intangible assets, net |  |  | 1,277 |
Other Liabilities |  |  |  |
Weighted average amortization period | 12 years |  |  |
Direct Energy | Customer and supply contracts |  |  |  |
Other Assets |  |  |  |
Intangible assets, net |  |  | 610 |
Other Liabilities |  |  |  |
Weighted average amortization period | 12 years |  |  |
Direct Energy | Trade names |  |  |  |
Other Assets |  |  |  |
Intangible assets, net |  |  | 310 |
Other Liabilities |  |  |  |
Weighted average amortization period | 12 years |  |  |
Direct Energy | Renewable energy credits |  |  |  |
Other Assets |  |  |  |
Intangible assets, net |  |  | $ 124 |

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