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Segment Reporting (Allocation Of Goodwill And Intangible Assets Based On Geography) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	$ 180	$ 193
US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	10	21
Argentina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	15	16
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	63	60
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	42	41
Chile [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	40	45
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	10	10
Total Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total goodwill and intangible assets	$ 170	$ 172