Supplemental Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 515	$ 414	$ 484	$ 705
Accounts receivable, net	5,524	5,208
Inventories	1,258	1,179
Deferred income taxes	320	489
Other	910	747
Total current assets	8,527	8,037
Property and equipment, net	13,878	13,619
Investments of insurance subsidiaries	441	448
Investments in and advances to affiliates	167	121
Goodwill and other intangible assets	5,899	5,903
Deferred loan costs	221	237
Other	692	466
Total assets	29,825	28,831
Current liabilities:
Accounts payable	1,787	1,803
Accrued salaries	1,238	1,193
Other accrued expenses	1,563	1,913
Long-term debt due within one year	1,044	786
Total current liabilities	5,632	5,695
Long-term debt	27,426	27,590
Intercompany balances
Professional liability risks	1,045	949
Income taxes and other liabilities	1,740	1,525
Total liabilities	35,843
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	(7,384)	(8,270)
Noncontrolling interests	1,366	1,342
Total stockholders' deficit	(6,018)	(6,928)
Total liabilities and stockholders' deficit	29,825	28,831
HCA Holdings, Inc. Issuer [Member]
Current assets:
Cash and cash equivalents				22
Accounts receivable, net
Inventories
Deferred income taxes	320	489
Other
Total current assets	320
Property and equipment, net
Investments of insurance subsidiaries
Investments in and advances to affiliates	21,850	20,356
Goodwill and other intangible assets
Deferred loan costs	27	30
Other	476	250
Total assets	22,673
Current liabilities:
Accounts payable	3	1
Accrued salaries
Other accrued expenses	69	272
Long-term debt due within one year
Total current liabilities	72
Long-term debt	2,525	2,525
Intercompany balances	26,932	26,107
Professional liability risks
Income taxes and other liabilities	528	490
Total liabilities	30,057
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	(7,384)	(8,270)
Noncontrolling interests
Total stockholders' deficit	(7,384)
Total liabilities and stockholders' deficit	22,673
HCA Inc. Issuer [Member]
Current assets:
Cash and cash equivalents
Accounts receivable, net
Inventories
Deferred income taxes
Other
Total current assets
Property and equipment, net
Investments of insurance subsidiaries
Investments in and advances to affiliates
Goodwill and other intangible assets
Deferred loan costs	194	207
Other
Total assets	194
Current liabilities:
Accounts payable
Accrued salaries
Other accrued expenses	197	353
Long-term debt due within one year	952	702
Total current liabilities	1,149
Long-term debt	24,528	24,701
Intercompany balances	(9,497)	(10,513)
Professional liability risks
Income taxes and other liabilities	500	296
Total liabilities	16,680
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	(16,486)	(15,332)
Noncontrolling interests
Total stockholders' deficit	(16,486)
Total liabilities and stockholders' deficit	194
Subsidiary Guarantors [Member]
Current assets:
Cash and cash equivalents	113	112	167	383
Accounts receivable, net	2,671	2,565
Inventories	748	692
Deferred income taxes
Other	369	301
Total current assets	3,901
Property and equipment, net	7,762	7,504
Investments of insurance subsidiaries
Investments in and advances to affiliates	16	13
Goodwill and other intangible assets	1,698	1,695
Deferred loan costs
Other	21	48
Total assets	13,398
Current liabilities:
Accounts payable	1,132	1,169
Accrued salaries	721	694
Other accrued expenses	458	464
Long-term debt due within one year	51	45
Total current liabilities	2,362
Long-term debt	187	181
Intercompany balances	(20,763)	(19,428)
Professional liability risks
Income taxes and other liabilities	486	521
Total liabilities	(17,728)
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	31,007	29,185
Noncontrolling interests	119	99
Total stockholders' deficit	31,126
Total liabilities and stockholders' deficit	13,398
Subsidiary Non-Guarantors [Member]
Current assets:
Cash and cash equivalents	402	302	317	300
Accounts receivable, net	2,853	2,643
Inventories	510	487
Deferred income taxes
Other	541	446
Total current assets	4,306
Property and equipment, net	6,116	6,115
Investments of insurance subsidiaries	441	448
Investments in and advances to affiliates	151	108
Goodwill and other intangible assets	4,201	4,208
Deferred loan costs
Other	195	168
Total assets	15,410
Current liabilities:
Accounts payable	652	633
Accrued salaries	517	499
Other accrued expenses	839	824
Long-term debt due within one year	41	39
Total current liabilities	2,049
Long-term debt	186	183
Intercompany balances	3,328	3,834
Professional liability risks	1,045	949
Income taxes and other liabilities	226	218
Total liabilities	6,834
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	7,329	6,503
Noncontrolling interests	1,247	1,243
Total stockholders' deficit	8,576
Total liabilities and stockholders' deficit	15,410
Eliminations [Member]
Current assets:
Cash and cash equivalents
Accounts receivable, net
Inventories
Deferred income taxes
Other
Total current assets
Property and equipment, net
Investments of insurance subsidiaries
Investments in and advances to affiliates	(21,850)	(20,356)
Goodwill and other intangible assets
Deferred loan costs
Other
Total assets	(21,850)
Current liabilities:
Accounts payable
Accrued salaries
Other accrued expenses
Long-term debt due within one year
Total current liabilities
Long-term debt
Intercompany balances
Professional liability risks
Income taxes and other liabilities
Total liabilities
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	(21,850)	(20,356)
Noncontrolling interests
Total stockholders' deficit	(21,850)
Total liabilities and stockholders' deficit	$ (21,850)