Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 11,529	$ 10,733	$ 22,952	$ 21,356
Salaries and benefits	5,274	4,896	10,563	9,797
Supplies	1,917	1,795	3,832	3,592
Other operating expenses	2,118	1,965	4,228	3,895
Equity in earnings of affiliates	(7)	(13)	(16)	(23)
Depreciation and amortization	562	521	1,115	1,042
Interest expense	436	411	867	830
Gains on sales of facilities	(9)	(2)	(414)	(3)
Total expenses including equity in earnings of affiliates	10,291	9,573	20,175	19,130
Income before income taxes	1,238	1,160	2,777	2,226
Provision for income taxes	272	365	529	654
Net income	966	795	2,248	1,572
Net income attributable to noncontrolling interests	146	138	284	256
Net income attributable to HCA Healthcare, Inc.	$ 820	$ 657	$ 1,964	$ 1,316
Per share data:
Basic earnings	$ 2.35	$ 1.79	$ 5.62	$ 3.58
Diluted earnings	2.31	1.75	5.50	3.48
Shares used in earnings per share calculations (in millions):
Cash dividends declared per share	$ 0.35	$ 0.00	$ 0.70	$ 0.00
Basic	348,615	365,847	349,726	368,056
Diluted	355,039	375,338	357,388	377,647