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Leases (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
New Corporate Office | Agreement with Lessor to Construct and Lease Corporate Office Property |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |
Required percentage payment for specific full recourse events |  |  |  |  | 100.00%
Extension term of lease |  |  |  |  | 5 years
Required percentage payment to lessor for difference between project costs and sales proceeds |  |  |  |  | 83.00%
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
Power Purchase Arrangements |  |  |  |  |
Leases Disclosure [Line Items] |  |  |  |  |
Rental revenue | $ 61 | $ 64 | $ 146 | $ 146 |
Depreciation expense | $ 26 | $ 23 | $ 76 | $ 70 |

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