Contingencies - Asbestos (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) lawsuit	Dec. 31, 2019 USD ($)	Jan. 06, 2020 USD ($)	Dec. 31, 1993 USD ($)
Loss contingencies
Sale of goods containing asbestos from 1948 to 1958		$ 40,000,000
Liability from deconsolidation		471,000,000
Charge for deconsolidation of Paddock		14,000,000
Deconsolidation investing outflow		$ 47,000,000
Approximate number of claims disposed | lawsuit		401,200
Number of pending plaintiffs and claimants | lawsuit		850
Average indemnity payment per claim		$ 10,200
Asbestos-related cash payments			$ 151,000,000
Cash payments per claim disposed including legal costs			129,000
Asbestos-related liability, total amount accrued beginning in 1993 through current reporting period before insurance recoveries		$ 5,000,000,000.0			$ 975,000,000
Accrual of asbestos related liability			486,000,000
Asbestos related charges			$ 35,000,000
Paddock
Loss contingencies
Cash				$ 47,000,000
Liability from deconsolidation				$ 471,000,000
Charge for deconsolidation of Paddock	$ 14,000,000
Deconsolidation investing outflow	$ 47,000,000