Supplemental Condensed Consolidating Financial Information and Other Collateral-Related Information - Schedule of Consolidated Statements of Stockholder's Deficit and Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Presentation in HCA Healthcare, Inc. Consolidated Statements of Stockholders' Deficit:
Repurchase of common stock	$ (1,031)	$ (1,530)	$ (2,051)
Cash dividends declared ($1.40 per share)	(555)	(496)
Other	(102)	(48)	(53)
Presentation in HCA Healthcare, Inc. Consolidated Statements of Cash Flows (cash flows from financing activities):
Repurchases of common stock	(1,031)	(1,530)	(2,051)
Payment of dividends	(550)	(487)	0
Healthtrust, Inc. [Member]
Presentation in HCA Healthcare, Inc. Consolidated Statements of Stockholders' Deficit:
Repurchase of common stock	(1,031)	(1,530)	(2,051)
Share-based benefit plans	313	115	281
Cash dividends declared ($1.40 per share)	(555)	(496)
Other	(11)	(12)	(10)
Distributions to HCA Healthcare, Inc., net of contributions from HCA Healthcare, Inc.	(1,284)	(1,923)	(1,780)
Presentation in HCA Healthcare, Inc. Consolidated Statements of Cash Flows (cash flows from financing activities):
Repurchases of common stock	(1,031)	(1,530)	(2,051)
Payment of dividends	(550)	(487)
Cash distributions to HCA Healthcare, Inc.	$ (1,581)	$ (2,017)	$ (2,051)