Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details 4) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (140)	$ (138)
Accumulated Other Comprehensive Income (Loss), Other Components, Net of Tax	(12)	10
Total accumulated other comprehensive loss	$ (152)	$ (128)