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Consolidated Statement Of Shareholders' Equity (Unaudited) (Parenthetical)
shares in Millions
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Statement of Stockholders' Equity [Abstract]  
Issuance of common stock under stock option and benefit plans, shares 1.5
Repurchases and retirement of common stock, shares 1.9
Cash dividends declared, per share of common stock | $ / shares $ 1.275