Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details 4) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (131)	$ (140)
Accumulated Other Comprehensive Income (Loss), Other Components, Net of Tax	5	(12)
Total accumulated other comprehensive loss	$ (126)	$ (152)

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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