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QUARTERLY INFORMATION (unaudited) - Transformation and Other Costs (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interim Period, Costs Not Allocable [Line Items]
Loss Contingency Accrual, Provision	$ 0	$ 0	$ 0	$ 0	$ 97	$ 0	$ 0	$ 0
Mark To Market Activities Net	6,484,000	0	0	0	2,387	0	0	0
Compensation and benefits	100	18	81	12	17	41	2	106	$ 211	$ 166	$ 262
Total other expenses	47	26	31	33	31	22	19	17	$ 137	$ 89	$ 98
Restructuring & Other - Impairment Charges
Interim Period, Costs Not Allocable [Line Items]
Transformation cost	686	0	0	0	0	0	0	0
U.S. Domestic Package
Interim Period, Costs Not Allocable [Line Items]
Transformation cost	132	35	33	37	133	26	18	28
International Package
Interim Period, Costs Not Allocable [Line Items]
Transformation cost	12	6	71	7	10	26	2	84
Supply Chain & Freight
Interim Period, Costs Not Allocable [Line Items]
Transformation cost	$ 689	$ 3	$ 8	$ 1	$ 2	$ 11	$ 1	$ 11