Condensed Consolidated Comprehensive Income Statements (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 611	$ 467	$ 1,697	$ 1,442
Other comprehensive (loss) income before taxes:
Foreign currency translation	(58)	60	(18)
Unrealized gains (losses) on available-for-sale securities	2	1	10	(7)
Defined benefit plans		8		8
Pension costs included in salaries and benefits	3	9	11	24
Total defined benefit plans	3	17	11	32
Change in fair value of derivative financial instruments	8	(31)	(21)	9
Interest costs included in interest expense	34	33	99	97
Total change in fair value of derivative financial instruments	42	2	78	106
Other comprehensive (loss) income before taxes	(11)	80	81	131
Income taxes (benefits) related to other comprehensive income items	(4)	28	30	48
Other comprehensive (loss) income	(7)	52	51	83
Comprehensive income	604	519	1,748	1,525
Comprehensive income attributable to noncontrolling interests	93	102	349	310
Comprehensive income attributable to HCA Holdings, Inc.	$ 511	$ 417	$ 1,399	$ 1,215