CONSOLIDATED STATEMENT OF EQUITY (Parenthetical) - shares shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Stock incentive programs and related tax withholdings, shares	0.2	0.1	0.6
Purchase of common stock, shares	3.3	3.8	2.0