Summarized Quarterly Financial Data (unaudited)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Summarized Quarterly Financial Data (unaudited)

Summarized Quarterly Financial Data—(in millions, except per share amounts)

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Year Ended December 31, 2020:
Revenues	$	2,709	$	2,402	$	1,460	$	2,787
Income from operations	1,346		937		72		276
Net income (loss)	603		404		(508)		2
Net income (loss) attributable to common stockholders	375		197		(463)		(194)
Net income (loss) per share attributable to common stockholders—basic (1)	1.48		0.78		(1.84)		(0.77)
Net income (loss) per share attributable to common stockholders—diluted (1)	1.43		0.78		(1.84)		(0.77)
Year Ended December 31, 2019:
Revenues	$	2,261	$	2,292	$	2,170	$	3,007
Income from operations	606		432		307		1,016
Net income (loss)	337		2		(260)		1,153
Net income (loss) attributable to common stockholders	141		(114)		(318)		939
Net income (loss) per share attributable to common stockholders—basic (1)	0.55		(0.44)		(1.25)		3.70
Net income (loss) per share attributable to common stockholders—diluted (1)	0.54		(0.44)		(1.25)		3.34

(1)The sum of the quarterly net income (loss) per share—basic and diluted may not equal the full year amount as the computations of the weighted average common shares outstanding for basic and diluted shares outstanding for each quarter and the full year are performed independently.