Segment Information Geographic Areas (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 1,435	$ 2,448
Deferred Tax Assets, Other	92	121
Noncurrent Deferred Taxes Assets Excluded from Long-lived Assets	15	39
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	435	753
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	174	296
Western Hemisphere [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	609	1,049
MENA and Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	482	715
Europe/Sub-Sahara Africa/Russia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	344	684
Eastern Hemisphere [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 826	$ 1,399