Stock Compensation Plans (Restricted Stock, RSUs and Performance Shares Activity Rollforward) (Details) - Restricted Stock, Performance Shares, and Restricted Stock Units (RSUs) [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock, RSUs and Performance Shares Activity [Roll Forward]
Outstanding, beginning of year	2,974	2,576	2,890
Granted	1,251	1,853	932
Vested	(775)	(546)	(1,090)
Forfeited	(179)	(909)	(156)
Outstanding, end of year	3,271	2,974	2,576
Vested, end of year	152	123	89
Outstanding, beginning of year, weighted-average per share grant date fair value	$ 19	$ 18	$ 15
Granted, weighted-average per share grant date fair value	21	17	22
Vested, weighted-average per share grant date fair value	19	20	10
Forfeited, weighted-average per share grant date fair value	19	12	19
Outstanding, end of year, weighted-average per share grant date fair value	19	19	18
Vested, end of year, weighted-average per share grant date fair value	$ 17	$ 15	$ 14