Acquisitions and Dispositions (Summary of Purchase Price Allocations) (Details) number in Thousands, $ in Millions	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Nov. 05, 2014 USD ($) employee
Business Acquisition [Line Items]
Parts per day	1,500
Unrecorded Unconditional Purchase Obligation	$ 100
Goodwill	3,572	$ 3,669	$ 3,801
Total purchase price including cash in escrow and contingent payments	$ 43	$ 371	$ 189
Plaka Plasterboard Business [Member]
Business Acquisition [Line Items]
Entity Number of Employees	0
Comex acquisition
Business Acquisition [Line Items]
Entity Number of Employees | employee				3,900
Current assets				$ 340
Property, plant, and equipment				229
Trademarks with indefinite lives				1,022
Identifiable intangible assets				281
Goodwill				1,089
Other non-current assets				54
Total assets				3,015
Current liabilities				(331)
Non-current deferred tax liabilities				(410)
Long-term debt				(280)
Accrued pensions				(20)
Other long-term liabilities				(24)
Total liabilities				(1,065)
Total purchase price, net of cash acquired				$ 1,950