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Leases (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 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 $ 4 $ 34    
Depreciation expense $ 9 $ 27