SUPPLEMENTAL FINANCIAL INFORMATION Other Non-Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Equity investments	$ 4,076	$ 3,405
Inventory, Noncurrent	1,080	1,373
Operating Lease, Right-of-Use Asset	859	704
Assets for Plan Benefits, Defined Benefit Plan	208	456
Restricted Cash, Noncurrent	338	390
Other Assets, Miscellaneous, Noncurrent	458	276
Other Assets, Noncurrent	$ 7,019	$ 6,604