Schedule I - CONDENSED STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net revenues		$ 2,115	$ 2,185	$ 2,119	$ 1,972	$ 1,901	$ 993	$ 1,008	$ 966	$ 8,391		$ 4,868		$ 3,877
Operating expenses
Corporate expense										332		202		194
Other operating costs										155	[1]	65	[1]	91	[2]
Total operating expenses										7,652		4,331		3,651
Income from operations		$ 100	$ 232	$ 282	$ 125	$ 154	$ 84	$ 149	$ 150	739		537		226
Interest expense										(1,346)		(773)		(599)
Restructuring and support expenses										0		2,028		5,729
Other income/(loss)										791	[1]	95	[1]	(29)
Income/(loss) from continuing operations before income taxes										183		(2,370)		(6,131)
Income tax benefit/(provision)	[3],[4]									121		1,995		(327)
Net income/(loss)										304		(375)		(6,458)
Other comprehensive income, net of income taxes										(34)		6		(2)
Comprehensive income/(loss)										273		(362)		(3,051)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net revenues										2		2		2
Operating expenses
Corporate expense										33		88		123
Other operating costs										10		24		58
Total operating expenses										43		112		181
Income from operations										(41)		(110)		(179)
Interest expense										(55)		(18)		(5)
Gain on interests in subsidiaries										(316)		776		2,933
Restructuring and support expenses										0		1,842		5,729
Other income/(loss)										726		85		(30)
Income/(loss) from continuing operations before income taxes										314		(1,109)		(3,010)
Income tax benefit/(provision)										(11)		741		(39)
Net income/(loss)										303		(368)		(3,049)
Comprehensive income/(loss)										273		(362)		(3,051)
AOCI Attributable to Parent [Member] | Parent Company [Member]
Operating expenses
Other comprehensive income, net of income taxes										$ (30)		$ 6		$ (2)

[1] (2) Amounts include changes in fair value of the derivative liability related to the conversion option of the CEC Convertible Notes and the disputed claims liability as well as interest and dividend income.

[2] (3) Amounts primarily represent costs incurred in connection with development activities and reorganization activities, and/or recoveries associated with such items, including acquisition and integration costs, contract exit fees including exiting the fully bundled sales system of NV Energy for electric service at our Nevada properties, lease termination costs, gains and losses on asset sales, weather related property closure costs, demolition costs primarily at our Las Vegas properties for renovations, and project opening costs.

[3] (1) Taxes are recorded at the consolidated level and not estimated or recorded to our Las Vegas and Other U.S. segments.

[4] (1) Taxes are recorded at the consolidated level and not estimated or recorded to our Las Vegas and Other U.S. segments.