Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other current assets
Derivative assets-current	$ 75	$ 88
Held-to-maturity debt security held in trust	470
Insurance related (receivables, prepaid expenses and other)	172	103
Other	174	158
Total other current assets	891	349
Other assets
Deferred income taxes	521	365
Prepaid pension and post retirement	230	208
Insurance related receivables and other	67	68
Cash surrender value of life insurance policies	254	251
Equity method investments	70	70
Equity and other investments	126	118
Other	406	265
Total other assets	1,674	1,345
Other current liabilities
Accrued trade payables	594	558
Deferred revenue	430	617
Derivative liabilities	17	32
Employee benefits and withholdings	229	228
Contingent liability claims and other	566	244
Property, sales-related and other taxes	247	273
Pension and postretirement benefits	67	76
Other	906	747
Total other current liabilities	3,056	2,775
Other liabilities
Accrued income taxes - long-term portion	1,507	1,274
Employee benefits	312	299
Contingent liability claims and other	787	789
Finance leases, net of current obligations	111	75
Deferred income taxes	301	279
Other	257	294
Total other liabilities	$ 3,275	$ 3,010