Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details 4) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (138)	$ (161)
Accumulated Other Comprehensive Income (Loss), Other Components, Net of Tax	10	8
Total accumulated other comprehensive loss	$ (128)	$ (153)