LEASES 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 206	$ 224
Operating cash flows for finance leases	32	32
Financing cash flows for finance leases	65	61
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	245	179
Finance leases	$ 27	$ 34