CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Options exercised and awards vested in shares (in shares)	208,613,000	163,547,000	168,268,000
Treasury stock shares (in shares)		400,500,000	1,184,700,000