SUPPLEMENTAL FINANCIAL INFORMATION Other Non-Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Other Non-Current Assets [Abstract]
Equity investments	$ 3,622	$ 4,076
Inventories	876	1,080
Operating leases	1,006	859
Pension and postretirement	234	208
Restricted cash - non current	199	338
Other	517	458
Other non-current assets	6,454	$ 7,019
Restricted Cash	$ 373		$ 428