Selected Quarterly Financial Information - Schedule of Selected Quarterly Financial Information (unaudited) (Details) - USD ($)	3 Months Ended																12 Months Ended
	Dec. 31, 2020	[1]	Sep. 30, 2020	[1]	Jun. 30, 2020	[1]	Mar. 31, 2020	[1]	Dec. 31, 2019	[1]	Sep. 30, 2019	[1]	Jun. 30, 2019	[1]	Mar. 31, 2019	[1]	Dec. 31, 2020	[1]	Dec. 31, 2019	[1]	Dec. 31, 2018
Selected Quarterly Financial Information [Abstract]
Total revenues	$ 212,000,000		$ 208,000,000		$ 123,000,000		$ 351,000,000		$ 468,000,000		$ 466,000,000		$ 454,000,000		$ 450,000,000		$ 894,000,000		$ 1,838,000,000		$ 1,999,000,000
Total operating expenses	427,000,000		210,000,000		165,000,000		337,000,000		384,000,000		384,000,000		390,000,000		365,000,000		1,139,000,000		1,523,000,000		1,565,000,000
Income (loss) before income taxes	(221,000,000)		(12,000,000)		(56,000,000)		9,000,000		74,000,000		70,000,000		54,000,000		75,000,000		(280,000,000)		273,000,000		403,000,000
Net (loss) income	$ (154,000,000)		$ (7,000,000)		$ (48,000,000)		$ 8,000,000		$ 72,000,000		$ 50,000,000		$ 39,000,000		$ 55,000,000		$ (200,709,244)	[2]	$ 215,695,961	[2]	$ 298,124,983	[2]
Basic	$ (1.81)		$ (0.08)		$ (0.56)		$ 0.09		$ 0.83		$ 0.59		$ 0.43		$ 0.59		$ (2.36)		$ 2.43		$ 3.07
Diluted	$ (1.81)		$ (0.08)		$ (0.56)		$ 0.09		$ 0.83		$ 0.59		$ 0.43		$ 0.58		$ (2.36)		$ 2.42		$ 3.05

[1] The sum of the earnings per share for the four quarters may differ from annual earnings per share due to the required method of computing the weighted average shares in interim periods.

[2] Net (loss) income for years ended December 31, 2020, 2019, and 2018 was ($200,709,244), $215,695,961, and $298,124,983, respectively.