SEGMENT FINANCIAL DATA (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Segment Reporting Segment Profit Loss	$ 6,665	$ 7,739	$ 8,190
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest and other financial charges	(359)	(357)	(367)
Repositioning and other charges	(575)	(546)	(1,091)
Income before taxes	6,012	7,559	7,487
Other Postretirement Benefits [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Benefit plans income/(expense)	58	48	34
Corporate [Member]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Segment Reporting Segment Profit Loss	(96)	(256)	(281)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Repositioning and other charges	(110)	(241)	(502)
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Pension mark-to-market expense	(44)	(123)	(37)
Other income (expense)	(349)	360	(57)
Interest and other financial charges	(359)	(357)	(367)
Stock compensation expense	(168)	(153)	(175)
Repositioning and other charges	(575)	(546)	(1,091)
Income before taxes	6,012	7,559	7,487
Segment Reconciling Items [Member] \| Pension Plan [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Benefit plans income/(expense)	785	592	992
Segment Reconciling Items [Member] \| Other Postretirement Benefits [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Benefit plans income/(expense)	$ 57	$ 47	$ 32

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