SUPPLEMENTAL FINANCIAL INFORMATION Other Non-Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Other Non-Current Assets [Abstract]
Equity investments	$ 4,738	$ 4,076
Inventories	774	1,080
Operating leases	967	859
Pension and postretirement	258	208
Restricted cash - non current	199	338
Other	467	458
Other non-current assets	7,403	$ 7,019
Restricted Cash	$ 339		$ 425