CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
REVENUES
Revenues	$ 3,149	$ 1,464	$ 5,465	$ 6,145
OPERATING COSTS AND EXPENSES
Depreciation, amortization, and other	50	72	102	222
General, administrative, and other	187	178	398	448
Restructuring and merger-related charges	3	6	4	4
Costs and expenses	2,663	1,618	4,895	6,185
OPERATING INCOME (LOSS)	486	(154)	570	(40)
Gains and other income, net	5	5	6	1
Interest expense	(109)	(127)	(216)	(220)
Interest income	7	8	14	14
Equity in losses	(8)	(30)	(20)	(34)
INCOME (LOSS) BEFORE INCOME TAXES	381	(298)	354	(279)
Benefit for income taxes	41	64	57	76
Net income (loss)	$ 422	$ (234)	$ 411	$ (203)
EARNINGS (LOSS) PER SHARE
Earnings (loss) per share - basic (in USD per share)	$ 1.29	$ (0.72)	$ 1.26	$ (0.63)
Earnings (loss) per share - diluted (in USD per share)	$ 1.28	$ (0.72)	$ 1.25	$ (0.63)
Base management fees
REVENUES
Gross revenues	$ 156	$ 40	$ 262	$ 254
Franchise fees
REVENUES
Gross revenues	431	182	737	597
Incentive management fees
REVENUES
Gross revenues	55	12	88	12
Fee revenues
REVENUES
Gross revenues	642	234	1,087	863
Contract investment amortization	(18)	(21)	(35)	(46)
Revenues	624	213	1,052	817
Owned, leased, and other
REVENUES
Revenues	187	49	295	329
OPERATING COSTS AND EXPENSES
Operating costs	168	121	303	393
Reimbursements
REVENUES
Revenues	2,338	1,202	4,118	4,999
OPERATING COSTS AND EXPENSES
Operating costs	$ 2,255	$ 1,241	$ 4,088	$ 5,118