Summary of Significant Accounting Policies (Unaudited) Accumulated Other Comprehensive Income (Loss) (Details 6) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (129)	$ (140)
Accumulated Other Comprehensive Income (Loss), Other Components, Net of Tax	6	(12)
Accumulated other comprehensive loss	$ (123)	$ (152)