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Long-Term Incentive Compensation (Summary of Liability-Classified Restricted Stock Unit Activity) (Details) - Liability-Classified RSUs - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Units      
Number of Shares/Units, Unvested shares/units at January 1 (in shares) 11,613,000 12,992,000 8,202,000
Number of Shares/Units, Granted (in shares) 1,486,000 6,172,000 8,659,000
Number of Shares/Units, Vested (in shares) (4,522,000) (3,960,000) (2,624,000)
Number of Shares/Units, Forfeited (in shares) (640,000) (3,591,000) (1,245,000)
Number of Shares/Units, Unvested shares/units at December 31 (in shares) 7,937,000 11,613,000 12,992,000
Weighted Average Fair Value      
Weighted Average Fair Value, Unvested shares/units at January 1 (in dollars per share) $ 2.67 $ 2.42 $ 3.41
Weighted Average Fair Value, Granted (in dollars per share) 4.23 1.41 4.34
Weighted Average Fair Value, Vested (in dollars per share) 3.40 1.43 4.09
Weighted Average Fair Value, Forfeited (in dollars per share) 4.56 2.67 3.48
Weighted Average Fair Value, Unvested shares/units at December 31 (in dollars per share) $ 4.08 $ 2.67 $ 2.42
Workforce Reduction      
Number of Units      
Number of Shares/Units, Forfeited (in shares) (360,253) (2,010,196) (400,056)