Long-term Incentive Compensation (Summary of Liability-Classified Restricted Cash Unit Activity) (Details) - Performance cash awards shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Number of Units
Beginning balance (in shares) | shares	18,353
Granted (in shares) | shares	18,546
Vested (in shares) | shares	(4,319)
Forfeited (in shares) | shares	(1,615)
Ending balance (in shares) | shares	30,965
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