Long-term Incentive Compensation (Summary of Liability-Classified Restricted Cash Unit Activity) (Details) - Performance cash awards shares in Thousands	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Number of Units
Beginning balance (in shares) | shares	18,353
Granted (in shares) | shares	18,546
Vested (in shares) | shares	(4,373)
Forfeited (in shares) | shares	(2,708)
Ending balance (in shares) | shares	29,818
Weighted Average Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 1.00
Granted (in dollars per share) | $ / shares	1.00
Vested (in dollars per share) | $ / shares	1.00
Forfeited (in dollars per share) | $ / shares	1.00
Ending balance (in dollars per share) | $ / shares	$ 1.00