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Financing Receivables (Narrative) (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) MW | Dec. 31, 2019 USD ($)
Schedule of Financial Receivables [Line Items] |  |  |
Pre-Tax Lease write-down | $ 58 |  |
Energy Holdings [Member] |  |  |
Schedule of Financial Receivables [Line Items] |  |  |
Leveraged Leases, Net Investment in Leveraged Leases Disclosure, Investment in Leveraged Leases, Net |  | $ 186 | $ 169
Shawville Station [Member] |  |  |
Schedule of Financial Receivables [Line Items] |  |  |
Leveraged Leases, Net Investment in Leveraged Leases Disclosure, Investment in Leveraged Leases, Net |  | 4 |
Lease Receivable Gross Investment |  | $ 72 |
Lease Receivable Asset Capacity | MW |  | 596 |

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