Condensed Consolidated Comprehensive Income Statements - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 2,472	$ 779	$ 5,716	$ 2,693
Other comprehensive income (loss) before taxes:
Foreign currency translation	(31)	42	(20)	(39)
Unrealized gains (losses) on available-for-sale securities	(3)	1	(12)	13
Defined benefit plans	0	0	0	0
Pension costs included in salaries and benefits	7	4	21	12
Total defined benefit plans	7	4	21	12
Change in fair value of derivative financial instruments	(1)	0	(1)	(66)
Interest costs included in interest expense	10	9	28	15
Total change in fair value of derivative financial instruments	9	9	27	(51)
Other comprehensive income (loss) before taxes	(18)	56	16	(65)
Income taxes (benefits) related to other comprehensive income items	(1)	9	6	(10)
Other comprehensive income (loss)	(17)	47	10	(55)
Comprehensive income	2,455	826	5,726	2,638
Comprehensive income attributable to noncontrolling interests	203	111	574	365
Comprehensive income attributable to HCA Healthcare, Inc.	$ 2,252	$ 715	$ 5,152	$ 2,273