SCHEDULE I - PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Total revenues	$ 16,295	$ 16,241	$ 16,245	$ 16,107	$ 14,168	$ 14,206	$ 14,259	$ 14,279	$ 64,888	$ 56,912	$ 53,767
Expenses:
Operating costs									7,381	7,525	6,567
Merger termination fee and related costs, net									0	0	(936)
Depreciation									505	444	410
Interest									242	218	242
Other expense, net									(506)	33	0
Loss on sale of business									0	786	0
(Benefit) provision for income taxes									763	391	1,572
Equity in net earnings of Kindred at Home									14	11	0
Net income	$ 512	$ 689	$ 940	$ 566	$ 355	$ 644	$ 193	$ 491	2,707	1,683	2,448
Parent Company
Revenues:
Management fees charged to operating subsidiaries									1,789	1,666	1,864
Investment and other income, net									28	30	57
Total revenues									1,817	1,696	1,921
Expenses:
Operating costs									1,578	1,468	1,801
Merger termination fee and related costs, net									0	0	(936)
Depreciation									387	342	332
Interest									242	218	243
Total operating expenses									2,207	2,028	1,440
Other expense, net									(507)	33	0
Loss on sale of business									0	782	0
(Loss) income before income taxes and equity in net earnings of subsidiaries									117	(1,147)	481
(Benefit) provision for income taxes									27	(542)	61
(Loss) income before equity in net earnings of subsidiaries									90	(605)	420
Equity in net earnings of subsidiaries									2,603	2,277	2,028
Equity in net earnings of Kindred at Home									14	11	0
Net income									$ 2,707	$ 1,683	$ 2,448