Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (10,225)	$ (8,988)	$ (10,225)	$ (8,988)		$ (10,246)
Other Comprehensive Income (Loss), Net of Tax	304	2	21	104
Settlements and transfers related to separation from DowDuPont Inc.			0	1,963
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	40	49	40	49	$ (36)	64	$ 16	$ (51)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	122	52	4	138
Other Comprehensive Income (Loss), Tax	(27)	(11)	(2)	(29)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	95	41	2	109
Other Comprehensive Income (Loss), Net of Tax	76	33	(24)	100
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(25)	(11)	(34)	(12)
Reclassification from AOCI, Current Period, Tax	6	3	8	3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(19)	(8)	(26)	(9)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1,235)	(1,067)	(1,235)	(1,067)	(1,298)	(1,135)	(1,844)	(1,813)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	63	76	(98)	64
Other Comprehensive Income (Loss), Tax	2	15	14	14
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	65	91	(84)	78
Other Comprehensive Income (Loss), Net of Tax	63	67	(100)	36
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] | Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Settlements and transfers related to separation from DowDuPont Inc.	0	710	0	710
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2)	(24)	(16)	(42)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(8,498)	(7,635)	(8,498)	(7,635)	(8,639)	(8,781)	(7,824)	(7,965)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	34	0	34
Other Comprehensive Income (Loss), Tax	0	(10)	0	(10)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	24	0	24
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	184	108	369	274
Reclassification from AOCI, Current Period, Tax	(43)	(26)	(86)	(51)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	141	82	283	223
Other Comprehensive Income (Loss), Net of Tax	141	106	283	247
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Settlements and transfers related to separation from DowDuPont Inc.	0	83	0	83
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(532)	(335)	(532)	(335)	$ (556)	$ (394)	$ (131)	$ (56)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	17	(263)	(159)	(358)
Other Comprehensive Income (Loss), Tax	(2)	46	8	73
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	15	(217)	(151)	(285)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	12	17	19	10
Reclassification from AOCI, Current Period, Tax	(3)	(4)	(6)	(4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9	13	13	6
Other Comprehensive Income (Loss), Net of Tax	$ 24	$ (204)	$ (138)	$ (279)