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Exit Activities and Discontinued Operations - Assets and Liabilities of Discontinued Operation (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Current |  |
Total current assets | $ 19 | $ 429
Non‑current |  |
Total non‑current assets | 0 | 2,680
Current |  |
Total current liabilities | 0 | 953
Non‑current |  |
Total non‑current liabilities | 0 | 1,894
Discontinued Operations, Held-for-sale |  |
Current |  |
Cash and cash equivalents | $ 0 | 136
Discontinued Operations, Held-for-sale | EnerBank |  |
Current |  |
Cash and cash equivalents |  | 136
Accounts receivable and other current assets |  | 18
Notes receivable, less allowance of $32 |  | 275
Total current assets |  | 429
Non‑current |  |
Plant, property, and equipment, net |  | 22
Notes receivable, less allowance of $91 |  | 2,612
Other non‑current assets |  | 46
Total non‑current assets |  | 2,680
Total assets |  | 3,109
Current |  |
Current portion of long-term debt |  | 915
Accounts payable and other current liabilities |  | 38
Total current liabilities |  | 953
Non‑current |  |
Long-term debt |  | 1,890
Other non‑current liabilities |  | 4
Total non‑current liabilities |  | 1,894
Total liabilities |  | 2,847
Notes receivable, allowance, current |  | 32
Notes receivable, allowance, noncurrent |  | $ 91

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