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Share-Based Compensation (Stock Option Activity) (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years
Options (Number of Shares):  
Outstanding at beginning of period | shares 7,062
Exercised | shares (419)
Forfeited and expired | shares (1,347)
Granted | shares 1,859
Outstanding at end of period | shares 7,155
Vested and expected to vest at end of period | shares 6,771
Eligible for exercise at end of period | shares 4,292
Weighted Average Exercise Price (in dollars per share):  
Outstanding at beginning of period | $ / shares $ 14.83
Exercised | $ / shares 10.76
Forfeited and expired | $ / shares 17.49
Granted | $ / shares 11.89
Outstanding at end of period | $ / shares 13.81
Vested and expected to vest at end of period | $ / shares 13.88
Eligible for exercise at end of period | $ / shares $ 14.70
Outstanding, weighted average remaining contractual term (in years) 6 years
Vested and expected to vest, weighted average remaining contractual term (in years) 70 months
Eligible for exercise, weighted average remaining contractual term (in years) 49 months
Outstanding, intrinsic value | $ $ 1
Vested and expected to vest, intrinsic value | $ 1
Eligible for exercise, intrinsic value | $ $ 1