Condensed Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 795	$ 791	$ 1,572	$ 1,602
Other comprehensive income (loss) before taxes:
Foreign currency translation	45	(86)	55	(129)
Unrealized gains on available-for-sale securities	2	3	5	5
Defined benefit plans	0	0	0	0
Pension costs included in salaries and benefits	4	5	9	9
Total defined benefit plans	4	5	9	9
Change in fair value of derivative financial instruments	(11)	(32)	(8)	(70)
Interest costs included in interest expense	6	28	13	56
Total change in fair value of derivative financial instruments	(5)	(4)	5	(14)
Other comprehensive income (loss) before taxes	46	(82)	74	(129)
Income taxes (benefits) related to other comprehensive income items	19	(32)	29	(50)
Other comprehensive income (loss)	27	(50)	45	(79)
Comprehensive income	822	741	1,617	1,523
Comprehensive income attributable to noncontrolling interests	138	133	256	250
Comprehensive income attributable to HCA Healthcare, Inc.	$ 684	$ 608	$ 1,361	$ 1,273