SHAREHOLDERS' EQUITY - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance				$ 29,861
Other comprehensive income (loss)		$ 695	$ 1,433	2,241	$ 3,010
Ending balance	[1]	34,793	29,153	34,793	29,153
Adjustments to investment securities before reclassifications		(420)	(877)	(1,382)	(2,888)
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance		(10,194)	(12,852)	(11,732)	(14,414)
Ending balance		(9,498)	(11,361)	(9,498)	(11,361)
Investment securities including noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance		47	59	61	(39)
Other comprehensive income (loss) before reclassifications		3	30	44	151
Other comprehensive income (loss) before reclassifications, deferred taxes		0	15	7	30
Reclassifications from other comprehensive income		5	(12)	(50)	(35)
Reclassifications from other comprehensive income, deferred taxes		2	(3)	(12)	(9)
Other comprehensive income (loss)		9	18	(5)	116
Investment securities attributable to noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss)		0	0	0	0
Investment securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss)		9	18	(5)	116
Ending balance		55	77	55	77
Currency translation adjustments including noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance		(4,743)	(5,874)	(4,818)	(6,134)
Other comprehensive income (loss) before reclassifications		55	(189)	(558)	(191)
Other comprehensive income (loss) before reclassifications, deferred taxes		(59)	(12)	(39)	27
Reclassifications from other comprehensive income		0	951	691	1,234
Reclassifications from other comprehensive income, deferred taxes		0	(5)	0	(9)
Other comprehensive income (loss)		55	762	133	1,043
Currency translation adjustments attributable to noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss)		0	(63)	3	(41)
Currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss)		55	824	129	1,084
Ending balance		(4,689)	(5,050)	(4,689)	(5,050)
Cash flow hedges including noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance		(109)	26	49	13
Other comprehensive income (loss) before reclassifications		62	(30)	(160)	(43)
Other comprehensive income (loss) before reclassifications, deferred taxes		62	(4)	(7)	(1)
Reclassifications from other comprehensive income		(38)	28	26	56
Reclassifications from other comprehensive income, deferred taxes		(13)	6	(5)	7
Other comprehensive income (loss)		24	(2)	(134)	13
Cash flow hedges attributable to noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss)		0	1	0	2
Cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss)		24	(2)	(134)	11
Ending balance		(86)	24	(86)	24
Benefit plans including noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance		(5,387)	(7,063)	(7,024)	(8,254)
Other comprehensive income (loss) before reclassifications		(87)	39	58	(72)
Other comprehensive income (loss) before reclassifications, deferred taxes		(22)	1	6	36
Reclassifications from other comprehensive income		695	616	2,190	1,910
Reclassifications from other comprehensive income, deferred taxes		187	170	613	517
Other comprehensive income (loss)		609	655	2,248	1,838
Benefit plans attributable to noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss)		0	4	3	(4)
Benefit plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Other comprehensive income (loss)		609	650	2,245	1,842
Ending balance		$ (4,779)	$ (6,412)	(4,779)	$ (6,412)
BioPharma | Benefit plans including noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Reclassifications from other comprehensive income				(836)
Currency translation, net of taxes				$ 688

[1] Total equity balance increased by $5,639 in the last twelve months from September 30, 2019, primarily due to after-tax gain of $11,214 million due to the sale of our BioPharma business within our Healthcare segment, partially offset by after-tax change in unrealized loss on our remaining interest in Baker Hughes $(3,679) million in the nine months ended September 30, 2020. See Notes 2 and 21 for further information.