Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Business Acquisitions Information
Purchase price paid for business combinations (net of cash acquired)	$ 17	$ 2,910
Supplemental information:
Purchase price paid for business combinations (net of cash acquired)	17	$ 2,910
Capital Safety
Supplemental information:
Adjustments to the preliminary purchase price allocations within the allocation period primarily related to contingent liabilities and certain tax-related items	$ 35