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Leases (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2019 | Jul. 31, 2016
Lessor | New Corporate Office | Agreement with Lessor to Construct and Lease Corporate Office Property |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Amount of financing commitments to fund estimated project costs |  |  |  |  |  | $ 465 | $ 365
Leasing arrangement, charge |  |  | $ 71 |  |  |  |
Leasing arrangement, charge after tax |  |  | $ 53 |  |  |  |
Lease effective termination date |  |  | 2021-04 |  |  |  |
Power Purchase Arrangement |  |  |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |  |  |
Rental revenue | $ 6 | $ 58 |  | $ 17 | $ 147 |  |
Depreciation expense | $ 9 | $ 29 |  | $ 26 | $ 87 |  |

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