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Share-Based Compensation (Summary of Significant Ranges of Outstanding and Exercisable Stock Options) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Stock Options Outstanding (in shares) | shares 1,406,371
Weighted-Average Remaining Contractual Term, Outstanding Options 2 years 7 months 24 days
Weighted-Average Exercise Price, Options Outstanding (in dollars per share) $ 22.32
Aggregate Intrinsic Value, Options Outstanding | $ $ 63
Number of Stock Options Exercisable (in shares) | shares 1,406,371
Weighted-Average Remaining Contractual Term, Exercisable Options 2 years 7 months 24 days
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 22.32
Aggregate Intrinsic Value, Options Exercisable | $ $ 63
$17.36 - 19.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 17.36
Range of Exercise Prices, Upper Limit (in dollars per share) $ 19.99
Number of Stock Options Outstanding (in shares) | shares 140,733
Weighted-Average Remaining Contractual Term, Outstanding Options 3 years 1 month 17 days
Weighted-Average Exercise Price, Options Outstanding (in dollars per share) $ 19.74
Aggregate Intrinsic Value, Options Outstanding | $ $ 7
Number of Stock Options Exercisable (in shares) | shares 140,733
Weighted-Average Remaining Contractual Term, Exercisable Options 3 years 1 month 17 days
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 19.74
Aggregate Intrinsic Value, Options Exercisable | $ $ 7
$20.00 - 25.75  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 20.00
Range of Exercise Prices, Upper Limit (in dollars per share) $ 25.75
Number of Stock Options Outstanding (in shares) | shares 1,237,333
Weighted-Average Remaining Contractual Term, Outstanding Options 2 years 7 months 13 days
Weighted-Average Exercise Price, Options Outstanding (in dollars per share) $ 22.16
Aggregate Intrinsic Value, Options Outstanding | $ $ 55
Number of Stock Options Exercisable (in shares) | shares 1,237,333
Weighted-Average Remaining Contractual Term, Exercisable Options 2 years 7 months 13 days
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 22.16
Aggregate Intrinsic Value, Options Exercisable | $ $ 55
$25.76 - 45.38  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Limit (in dollars per share) $ 25.76
Range of Exercise Prices, Upper Limit (in dollars per share) $ 45.38
Number of Stock Options Outstanding (in shares) | shares 28,305
Weighted-Average Remaining Contractual Term, Outstanding Options 1 year 2 months 1 day
Weighted-Average Exercise Price, Options Outstanding (in dollars per share) $ 41.77
Aggregate Intrinsic Value, Options Outstanding | $ $ 1
Number of Stock Options Exercisable (in shares) | shares 28,305
Weighted-Average Remaining Contractual Term, Exercisable Options 1 year 2 months 1 day
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 41.77
Aggregate Intrinsic Value, Options Exercisable | $ $ 1