Other Financial Data - Other Charges (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other charges (income):
Intangibles amortization	$ 208	$ 188	$ 151
Reorganization of businesses	40	61	33
Loss (gain) on legal settlements	3	3	(1)
Asset impairments	0	1	10
Environmental reserve expense	0	57	0
Gain on the recovery of long-term receivables	0	0	(47)
Operating lease ROU asset impairment	5
Acquisition-related transaction fees	3	24	1
Other	1	0	0
Other charges (income):	$ 260	$ 334	147
Expected environmental remediation period		30 years
Accrual for environmental loss contingencies		$ 107
Proceeds from legal settlements, excluding accrued professional fees			47
Proceeds from legal settlements			57
Accrued professional fees			$ 10