Condensed Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 665	$ 632	$ 1,385	$ 1,086
Other comprehensive income before taxes:
Foreign currency translation	64	30	13	40
Unrealized (losses) gains on available-for-sale securities	(5)	4	(4)	8
Defined benefit plans	0	0	0	0
Pension costs included in salaries and benefits	5	4	11	8
Total defined benefit plans	5	4	11	8
Change in fair value of derivative financial instruments	(7)	(19)	(30)	(29)
Interest costs included in interest expense	31	32	62	65
Total change in fair value of derivative financial instruments	24	13	32	36
Other comprehensive income before taxes	88	51	52	92
Income taxes related to other comprehensive income items	34	18	19	34
Other comprehensive income	54	33	33	58
Comprehensive income	719	665	1,418	1,144
Comprehensive income attributable to noncontrolling interests	158	149	287	256
Comprehensive income attributable to HCA Holdings, Inc.	$ 561	$ 516	$ 1,131	$ 888