Condensed Consolidated Comprehensive Income Statements - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,580	$ 698
Other comprehensive income (loss) before taxes:
Foreign currency translation	8	(73)
Unrealized losses on available-for-sale securities	(11)	(5)
Defined benefit plans	0	0
Pension costs included in salaries and benefits	7	4
Total defined benefit plans	7	4
Change in fair value of derivative financial instruments	1	(60)
Interest expense (benefits) included in interest expense	9	(1)
Total change in fair value of derivative financial instruments	10	(61)
Other comprehensive loss before taxes	14	(135)
Income taxes (benefits) related to other comprehensive income items	3	(24)
Other comprehensive income (loss)	11	(111)
Comprehensive income	1,591	587
Comprehensive income attributable to noncontrolling interests	157	117
Comprehensive income attributable to HCA Healthcare, Inc.	$ 1,434	$ 470