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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Share-Based Compensation Activity (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Restricted Stock Units  
Equity Instruments Other than Options, Number of Shares Roll Forward  
Outstanding at January 1, 2019 | shares 2.2
Granted | shares 2.5
Distributed/Exercised | shares (1.0) [1]
Forfeited/Expired | shares (0.3)
Outstanding at December 31, 2019 | shares 3.4
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward  
Outstanding at January 1, 2019 | $ / shares $ 27.37
Granted | $ / shares 13.41
Distributed/Exercised | $ / shares 28.17
Forfeited/Expired | $ / shares 18.81
Outstanding at December 31, 2019 | $ / shares $ 17.89
Options, Weighted Average Exercise Price Roll Forward  
Fair Value of Shares Distributed in Period | $ $ 27.0
Performance Share Units  
Equity Instruments Other than Options, Number of Shares Roll Forward  
Outstanding at January 1, 2019 | shares 1.7 [2]
Granted | shares 0.9 [2]
Distributed/Exercised | shares (0.2) [2],[3]
Forfeited/Expired | shares (0.1) [2]
Outstanding at December 31, 2019 | shares 2.3 [2]
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward  
Outstanding at January 1, 2019 | $ / shares $ 28.10
Granted | $ / shares 11.06
Distributed/Exercised | $ / shares 32.66
Forfeited/Expired | $ / shares 19.35
Outstanding at December 31, 2019 | $ / shares $ 19.16
Options, Weighted Average Exercise Price Roll Forward  
Fair Value of Shares Distributed in Period | $ $ 8.0
Options  
Options, Number of Shares Roll Forward  
Outstanding at January 1, 2019 | shares 3.7 [4]
Granted | shares 0.8 [4]
Distributed/Exercised | shares 0.0 [4]
Forfeited/Expired | shares (0.4) [4]
Outstanding at December 31, 2019 | shares 4.1 [4],[5]
Options, Weighted Average Exercise Price Roll Forward  
Outstanding at January 1, 2019 | $ / shares $ 30.98
Granted | $ / shares 13.44
Distributed/Exercised | $ / shares 0
Forfeited/Expired | $ / shares 28.74
Outstanding at December 31, 2019 | $ / shares $ 27.50
Intrinsic Value of Outstanding Options | $ $ 0.0
Weighted Average Remaining Contractual Life of Outstanding Options 5 years 8 months 12 days
Exercisable Stock Options, Additional Disclosures  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares 2.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares $ 32.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ $ 0.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 10 months 24 days
[1] The total fair value of RSUs which were distributed during the year ended December 31, 2019 was $27 million.
[2] The PSU amounts in the table are shown at the target amount of the award.
[3] The total fair value of PSUs which were distributed during the year ended December 31, 2019 was $8 million.
[4] As of December 31, 2019, 2.5 million of the 4.1 million outstanding stock options were exercisable with a weighted average exercise price of $32.19, an intrinsic value of zero and a weighted average remaining contractual life of 3.9 years.
[5] Options outstanding at December 31, 2019 have an intrinsic value of zero and have a weighted average remaining contractual life of 5.7 years.