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Share-Based Compensation (Summary Of Restricted Stock Units Transactions) (Details) - Restricted Stock Units [Member]
shares in Millions
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Restricted Stock Activity [Roll Forward]  
Nonvested shares of restricted stock units beginning (in shares) | shares 8.5
Number of Shares, Granted (in shares) | shares 6.2
Number of Shares, Achieved (in shares) | shares 0.0
Number of Shares, Released (in shares) | shares (4.3)
Number of Shares, Canceled (in shares) | shares (0.7)
Nonvested shares of restricted stock units ending (in shares) | shares 9.7
Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value, Nonvested shares of restricted stock units beginning (in dollars per share) | $ / shares $ 10.52
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares 9.50
Weighted Average Grant Date Fair Value, Achieved (in dollars per share) | $ / shares 0.00
Weighted Average Grant Date Fair Value, Released (in dollars per share) | $ / shares 9.80
Weighted Average Grant Date Fair Value, Canceled (in dollars per share) | $ / shares 11.75
Weighted Average Grant Date Fair Value, Nonvested shares of restricted stock units ending (in dollars per share) | $ / shares $ 10.10