GEOGRAPHIC AREAS - Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 14,038	$ 14,221
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	13,731	13,922
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 307	$ 299