Long-Term Incentive Compensation (Summary of Liability-Classified Restricted Stock Unit Activity) (Details) - Liability-Classified RSUs - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Units
Number of Shares/Units, Unvested shares/units at January 1 (in shares)	7,937,000	11,613,000	12,992,000
Number of Shares/Units, Granted (in shares)	0	1,486,000	6,172,000
Number of Shares/Units, Vested (in shares)	(3,817,000)	(4,522,000)	(3,960,000)
Number of Shares/Units, Forfeited (in shares)	(170,000)	(640,000)	(3,591,000)
Number of Shares/Units, Unvested shares/units at December 31 (in shares)	3,950,000	7,937,000	11,613,000
Weighted Average Fair Value
Weighted Average Fair Value, Unvested shares/units at January 1 (in dollars per share)	$ 4.08	$ 2.67	$ 2.42
Weighted Average Fair Value, Granted (in dollars per share)	0	4.23	1.41
Weighted Average Fair Value, Vested (in dollars per share)	4.48	3.40	1.43
Weighted Average Fair Value, Forfeited (in dollars per share)	6.83	4.56	2.67
Weighted Average Fair Value, Unvested shares/units at December 31 (in dollars per share)	$ 4.81	$ 4.08	$ 2.67
Workforce Reduction
Number of Units
Number of Shares/Units, Forfeited (in shares)		(360,253)	(2,010,196)