Contingencies - Asbestos (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) item lawsuit	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Dec. 31, 1993 USD ($)
Asbestos
Sale of goods containing asbestos from 1948 to 1958	$ 40,000,000
Loss contingency, plaintiffs damages	$ 722,000,000
Approximate number of claims disposed of to date | lawsuit	400,000
Average indemnity payment per claim	$ 9,800
Asbestos-related cash payments	105,000,000	$ 110,000,000	$ 125,000,000
Cash payments per claim disposed including legal costs	86,000	83,000	71,000
Asbestos-related liability, total amount accrued beginning in 1993 through 2018 before insurance recoveries	5,000,000,000			$ 975,000,000
Accrual of asbestos related liability	602,000,000	582,000,000
Asbestos related charges	$ 125,000,000	$ 0	$ 0
Approximate number of plaintiffs and claimants asbestos claims pending against the entity
Pending at beginning of year (in number of litigants) | item	1,330	1,400	2,080
Disposed (in number of litigants) | item	1,220	1,320	1,750
Filed (in number of litigants) | item	960	1,250	1,070
Pending at end of year (in number of litigants) | item	1,070	1,330	1,400
Minimum
Asbestos
Period in which significant majority of claims to be received	5 years
Maximum
Asbestos
Period in which significant majority of claims to be received	7 years