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Leases (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 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 $ 55   $ 11 $ 89    
Depreciation expense $ 8 $ 31   $ 17 $ 58