SUPPLEMENTAL FINANCIAL INFORMATION Other Current Assets (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Other Current Assets [Abstract]
Prepaid and refundable income taxes	$ 1,637	$ 1,799
Research and Development	555	492
Equity investments	207	619
Other	1,029	787
Other current assets	3,568	3,786
Restricted Cash	339	429
Other current assets	3,568	3,786
Other Current Assets [Member]
Restricted Cash	$ 140	$ 89