Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial information

	For the Quarters Ended
	December 31, 2018		September 30, 2018		June 30, 2018		March 31, 2018
	(Amounts in millions, except per share data)
Net revenues	$	2,381	$	1,512	$	1,641	$	1,965
Cost of revenues	832		513		510		662
Operating income	694		265		434		595
Net income	650		260		402		500
Basic earnings per common share	0.85		0.34		0.53		0.66
Diluted earnings per common share	0.84		0.34		0.52		0.65

	For the Quarters Ended
	December 31, 2017			September 30, 2017		June 30, 2017		March 31, 2017
	(Amounts in millions, except per share data)
Net revenues	$	2,043		$	1,618	$	1,631	$	1,726
Cost of revenues	803			552		561		585
Operating income	221			257		339		493
Net income (loss)	(584		)	188		243		426
Basic earnings (loss) per common share	(0.77		)	0.25		0.32		0.57
Diluted earnings (loss) per common share	(0.77		)	0.25		0.32		0.56