Consolidated Comprehensive Income Statements - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 7,721	$ 4,387	$ 4,145
Other comprehensive income (loss) before taxes:
Foreign currency translation	(9)	18	5
Unrealized (losses) gains on available-for-sale securities	(16)	14	15
Defined benefit plans	87	(71)	(63)
Pension costs included in salaries and benefits	28	28	13
Total defined benefit plans	115	(43)	(50)
Change in fair value of derivative financial instruments	1	(66)	(50)
Interest costs (benefits) included in interest expense	37	24	(17)
Total change in fair value of derivative financial instruments	38	(42)	(67)
Other comprehensive income (loss) before taxes	128	(53)	(97)
Income taxes (benefits) related to other comprehensive income items	30	(11)	(18)
Other comprehensive income (loss)	98	(42)	(79)
Comprehensive income	7,819	4,345	4,066
Comprehensive income attributable to noncontrolling interests	765	633	640
Comprehensive income attributable to HCA Healthcare, Inc.	$ 7,054	$ 3,712	$ 3,426