Long-term Incentive Compensation (Summary of Liability-Classified Restricted Cash Unit Activity) (Details) - Performance cash awards	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Number of Shares
Number of Shares/Units, Unvested shares/units at January 1 (in shares)	0
Number of Shares/Units, Granted (in shares)	20,044,000
Number of Shares/Units, Vested (in shares)	(100,000)
Number of Shares/Units, Forfeited (in shares)	(1,591,000)
Number of Shares/Units, Unvested shares/units at December 31 (in shares)	18,353,000
Weighted Average Fair Value
Weighted Average Fair Value, Unvested shares/units at January 1 (in dollars per share) | $ / shares	$ 0
Weighted Average Fair Value, Granted (in dollars per share) | $ / shares	1.00
Weighted Average Fair Value, Vested (in dollars per share) | $ / shares	1.00
Weighted Average Fair Value, Forfeited (in dollars per share) | $ / shares	1.00
Weighted Average Fair Value, Unvested shares/units at December 31 (in dollars per share) | $ / shares	$ 1.00
Workforce Reduction
Number of Shares
Number of Shares/Units, Forfeited (in shares)	(945,500)