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Leases (Narrative) (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2024
Mar. 31, 2024
Mar. 31, 2023
Leases Disclosure [Line Items]      
Charge in connection with settlement of an agreement   $ 47  
Charge in connection with settlement of an agreement, after tax   35  
Forecast      
Leases Disclosure [Line Items]      
Payment of settlement of an agreement related to the offshore wind installation vessel under development $ 47    
Power Purchase Arrangement      
Leases Disclosure [Line Items]      
Rental revenue   $ 3 $ 5
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]   Revenues Revenues
Depreciation expense   $ 3 $ 1