Stock-Based Compensation (NQSO - Details 2) - Non-Qualified Stock Options [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock-Based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	0
NQSO activity and changes
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Options Outstanding - Maximum Contractual Term (in years)	10 years
Outstanding at the beginning of the period (in shares)	2,071,913
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(548,994)
Exercised (in shares)	0
Outstanding at the end of the period (in shares)	1,522,919	2,071,913
Exercisable at the end of the period (in shares)	1,522,919
Weighted Average Exercise Price at the beginning of the period (in dollars per share)	$ 32.27
Forfeited - Weighted Average Exercise Price (in dollars per share)	52.34
Weighted Average Exercise Price at the end of the period (in dollars per share)	25.03	$ 32.27
Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 25.03
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 years
Options Exercisable - Weighted Average Remaining Contractual Term (in years)	3 years	3 years
Options Outstanding - Aggregate Intrinsic Value	$ 0	$ 0
Options Exercisable - Aggregate Intrinsic Value	0
Weighted average grant date fair value of options granted, the total intrinsic value of options exercised, and the cash received from exercises of options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	0	2	$ 7
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	$ 0	$ 9	$ 21