Consolidated Statement Of Shareholders' Equity (Unaudited) (Parenthetical) shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) shares
Statement of Stockholders' Equity [Abstract]
Issuance of common stock under stock option and benefit plans, shares	1.6
Issuance of common stock under stock option and benefit plans, excess income tax benefit | $	$ 31
Repurchase and retirement of common stock, shares	0.1