Consolidated Statement Of Shareholders' Equity (Unaudited) (Parenthetical) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Statement of Stockholders' Equity [Abstract]
Issuance of common stock under stock option and benefit plans, shares	1.1
Issuance of common stock under stock option and benefit plans, excess income tax benefit | $	$ 16
Repurchase and retirement of common stock, shares	0.1
Cash dividends declared, per share of common stock | $ / shares	$ 0.38