Asset Impairment, Restructuring and Other Special Charges - Total Charges Related to Asset Impairment, Restructuring and Other Special Charges (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Restructuring charges (credits):
Severance and other costs	$ (7)	$ 26
Facility exit costs	1	0
Acquisition related charges:
Transaction and integration costs	24	81
Non-cash and other items:
Asset impairment	0	9
Asset write-down	28	2
Net periodic benefit cost (credits)	0	(9)
Settlements and other	0	(1)
Total expense	46	108
Severance
Non-cash and other items:
Reserve adjustments	(7)	(13)
Restructuring Cost and Reserve [Line Items]
Reserve adjustments	$ (7)	$ (13)

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