Contingencies - Asbestos (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($) item	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 1993 USD ($)
Percentage of asbestos plaintiffs
Sale of goods containing asbestos from 1948 to 1958	$ 40,000,000
Number of pending plaintiffs and claimants | item	2,000
Loss contingency, plaintiffs damages, maximum amount			$ 950,000,000
Period in which significant majority of claims to be received	10 years
Approximate number of claims disposed of to date | item	396,000
Average indemnity payment per claim	$ 9,200
Payments for Asbestos-Related Liabilities	$ 24,000,000	$ 35,000,000	138,000,000	$ 148,000,000	$ 158,000,000
Cash payments per claim disposed including legal costs			95,000	81,000	93,000
Asbestos-related liability, total amount accrued beginning in 1993 through 2014 before insurance recoveries			4,900,000,000			$ 975,000,000
Accrual of asbestos related liability			817,000,000	939,000,000
Asbestos related charges			$ 16,000,000	$ 46,000,000	$ 12,000,000
Damages unspecified or sufficient to invoke jurisdictional minimum
Percentage of asbestos plaintiffs
Percentage of asbestos plaintiffs, approximate percentage			82.00%
Damages of $15 million or less
Percentage of asbestos plaintiffs
Percentage of asbestos plaintiffs, approximate percentage			11.00%
Loss contingency, plaintiffs damages, maximum amount			$ 15,000,000
Damages greater than $15 million but less than $100 million
Percentage of asbestos plaintiffs
Percentage of asbestos plaintiffs, approximate percentage			7.00%
Loss contingency, plaintiffs damages, minimum amount			$ 15,000,000
Loss contingency, plaintiffs damages, maximum amount			$ 100,000,000