Condensed Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 573	$ 611	$ 1,958	$ 1,697
Other comprehensive income (loss) before taxes:
Foreign currency translation	(54)	(58)	(41)	(18)
Unrealized gains (losses) on available-for-sale securities	2	2	(2)	10
Defined benefit plans	0	0	0	0
Pension costs included in salaries and benefits	6	3	17	11
Total defined benefit plans	6	3	17	11
Change in fair value of derivative financial instruments	(17)	8	(47)	(21)
Interest costs included in interest expense	31	34	93	99
Total change in fair value of derivative financial instruments	14	42	46	78
Other comprehensive income (loss) before taxes	(32)	(11)	20	81
Income taxes (benefits) related to other comprehensive income items	(13)	(4)	6	30
Other comprehensive income (loss)	(19)	(7)	14	51
Comprehensive income	554	604	1,972	1,748
Comprehensive income attributable to noncontrolling interests	124	93	411	349
Comprehensive income attributable to HCA Holdings, Inc.	$ 430	$ 511	$ 1,561	$ 1,399