Stock-Based Compensation Plans (Schedule of Non-Vested Stock Option Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares (000)
Shares, Nonvested stock options at Beginning of Year (in shares)	4,842	6,540	9,397
Shares, Granted (in shares)	1,049	1,613	1,295
Shares, Vested (in shares)	(2,165)	(3,089)	(3,941)
Shares, Forfeited (in shares)	(151)	(222)	(211)
Shares, Nonvested stock options at End of Year (in shares)	3,575	4,842	6,540
Wtd. Avg Grant Date Fair Value
Wtd. Avg Grant Date Fair Value, Nonvested stock options at Beginning of Year (in dollars per share)	$ 4	$ 4	$ 4
Wtd. Avg Grant Date Fair Value, Granted (in dollars per share)	4	5	4
Wtd. Avg Grant Date Fair Value, Vested (in dollars per share)	4	4	4
Wtd. Avg Grant Date Fair Value, Forfeited (in dollars per share)	4	4	4
Wtd. Avg Grant Date Fair Value, Nonvested stock options at End of Year (in dollars per share)	$ 4	$ 4	$ 4