Condensed Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 745	$ 573	$ 2,347	$ 1,958
Other comprehensive income (loss) before taxes:
Foreign currency translation	(40)	(54)	(169)	(41)
Unrealized gains (losses) on available-for-sale securities	(2)	2	3	(2)
Defined benefit plans	0	0	0	0
Pension costs included in salaries and benefits	4	6	13	17
Total defined benefit plans	4	6	13	17
Change in fair value of derivative financial instruments	13	(17)	(57)	(47)
Interest costs included in interest expense	28	31	84	93
Total change in fair value of derivative financial instruments	41	14	27	46
Other comprehensive income (loss) before taxes	3	(32)	(126)	20
Income taxes (benefits) related to other comprehensive income items		(13)	(50)	6
Other comprehensive income (loss)	3	(19)	(76)	14
Comprehensive income	748	554	2,271	1,972
Comprehensive income attributable to noncontrolling interests	127	124	377	411
Comprehensive income attributable to HCA Holdings, Inc.	$ 621	$ 430	$ 1,894	$ 1,561