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Revenues - Schedule of Significant Changes in Unbilled Revenue and Deferred Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Unbilled Revenue      
Balance at beginning of period $ 9 $ 11 $ 6
Amount included in opening balance transferred to other accounts during period (9) (11) (6)
Amount recorded during period 86 79 81
Amounts recorded during period transferred to other accounts (80) (70) (70)
Other changes 0 0 0
Balance at end of period 6 9 11
Deferred Revenue      
Balance at beginning of period 452 519 501
Amount included in opening balance transferred to other accounts during period (192) (242) (271)
Amount recorded during period 814 853 956
Amounts recorded during period transferred to other accounts (650) (672) (656)
Other changes (6) (6) (11)
Balance at end of period $ 418 $ 452 $ 519