Stock-Based Compensation Plans (Schedule of Non-Vested Stock Option Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Shares, Nonvested restricted shares at Beginning of Year (in shares)	3,575	4,842	6,540
Shares, granted (in shares)	1,571	1,049	1,613
Shares, vested (in shares)	1,585	2,165	3,089
Shares, forfeited (in shares)	386	151	222
Shares, Nonvested restricted shares at End of Year (in shares)	3,175	3,575	4,842
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)	5	4	5
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)	$ 5	$ 4	$ 4