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Contingencies and Commitments - Leases (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]          
Right-of-use assets $ 551   $ 551   $ 516
Lease liabilities, current 159   159   144
Lease liabilities, non-current $ 389   $ 389   $ 379
Other information:          
Weighted-average remaining lease term (years) 5 years   5 years   5 years 1 month 6 days
Weighted-average discount rate 3.87%   3.87%   3.87%
Operating lease cost $ 52 $ 50 $ 105 $ 97