Capital Stock (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Common stock:
Balance, beginning of year		102,400,000	102,400,000	101,000,000	99,500,000
Activity under stock plans			1,600,000	1,400,000	1,500,000
Balance, end of year	104,000,000		104,000,000	102,400,000	101,000,000
Treasury stock:
Balance, beginning of year		2,500,000	2,500,000	2,200,000	2,200,000
Issued under stock plans					(500,000)
Repurchased	896,653	1,573,588	2,600,000	300,000	500,000
Balance, end of year	5,100,000		5,100,000	2,500,000	2,200,000
Common stock outstanding	98,900,000		98,900,000	99,900,000	98,800,000