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Stock-Based Compensation Plans (Schedule of Non-Vested Stock Option Activity) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Stock Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Shares, Nonvested stock options at Beginning of Year (in shares) 9,397 10,835 13,265
Shares, Granted (in shares) 1,295 3,227 2,966
Shares, Vested (in shares) (3,941) (4,343) (4,678)
Shares, Forfeited (in shares) (211) (322) (718)
Shares, Nonvested stock options at End of Year (in shares) 6,540 9,397 10,835
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
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 4 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
Non-Employee Director Stock Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Shares, Nonvested stock options at Beginning of Year (in shares) 0 0 0
Shares, Granted (in shares) 56 56 49
Shares, Vested (in shares) (56) (56) (49)
Shares, Forfeited (in shares) 0 0 0
Shares, Nonvested stock options at End of Year (in shares) 0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Wtd. Avg Grant Date Fair Value, Nonvested stock options at Beginning of Year (in dollars per share) $ 0 $ 0 $ 0
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) 5 4 5
Wtd. Avg Grant Date Fair Value, Forfeited (in dollars per share) 0 0 0
Wtd. Avg Grant Date Fair Value, Nonvested stock options at End of Year (in dollars per share) $ 0 $ 0 $ 0