Supplemental Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 484	$ 705	$ 472	$ 373
Accounts receivable, net	4,924	4,672
Inventories	1,135	1,086
Deferred income taxes	400	385
Other	828	915
Total current assets	7,771	7,763
Property and equipment, net	13,322	13,185
Investments of insurance subsidiaries	402	515
Investments in and advances to affiliates	125	104
Goodwill and other intangible assets	5,832	5,539
Deferred loan costs	250	290
Other	691	679
Total assets	28,393	28,075
Current liabilities:
Accounts payable	1,582	1,768
Accrued salaries	1,085	1,120
Other accrued expenses	1,764	1,849
Long-term debt due within one year	988	1,435
Total current liabilities	5,419	6,172
Long-term debt	27,389	27,495
Intercompany balances
Professional liability risks	959	973
Income taxes and other liabilities	1,670	1,776
Total liabilities	35,437	36,416
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	(8,376)	(9,660)
Noncontrolling interests	1,332	1,319
Total stockholders' deficit	(7,044)	(8,341)
Total liabilities and stockholders' deficit	28,393	28,075
HCA Holdings, Inc. Issuer [Member]
Current assets:
Cash and cash equivalents		22
Accounts receivable, net
Inventories
Deferred income taxes	400	385
Other	6	122
Total current assets	406	529
Property and equipment, net
Investments of insurance subsidiaries
Investments in and advances to affiliates	19,784	18,481
Goodwill and other intangible assets
Deferred loan costs	30	32
Other	315	469
Total assets	20,535	19,511
Current liabilities:
Accounts payable	1
Accrued salaries
Other accrued expenses	255	30
Long-term debt due within one year
Total current liabilities	256	30
Long-term debt	2,525	2,525
Intercompany balances	25,682	26,131
Professional liability risks
Income taxes and other liabilities	448	485
Total liabilities	28,911	29,171
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	(8,376)	(9,660)
Noncontrolling interests
Total stockholders' deficit	(8,376)	(9,660)
Total liabilities and stockholders' deficit	20,535	19,511
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	220	258
Other
Total assets	220	258
Current liabilities:
Accounts payable
Accrued salaries
Other accrued expenses	259	567
Long-term debt due within one year	906	1,360
Total current liabilities	1,165	1,927
Long-term debt	24,174	24,304
Intercompany balances	(10,477)	(12,407)
Professional liability risks
Income taxes and other liabilities	327	442
Total liabilities	15,189	14,266
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	(14,969)	(14,008)
Noncontrolling interests
Total stockholders' deficit	(14,969)	(14,008)
Total liabilities and stockholders' deficit	220	258
Subsidiary Guarantors [Member]
Current assets:
Cash and cash equivalents	167	383	149	115
Accounts receivable, net	2,481	2,448
Inventories	667	629
Deferred income taxes
Other	327	342
Total current assets	3,642	3,802
Property and equipment, net	7,467	7,417
Investments of insurance subsidiaries
Investments in and advances to affiliates	15	16
Goodwill and other intangible assets	1,695	1,697
Deferred loan costs
Other	37	31
Total assets	12,856	12,963
Current liabilities:
Accounts payable	1,012	1,203
Accrued salaries	634	638
Other accrued expenses	441	464
Long-term debt due within one year	43	39
Total current liabilities	2,130	2,344
Long-term debt	165	173
Intercompany balances	(18,677)	(17,130)
Professional liability risks
Income taxes and other liabilities	639	629
Total liabilities	(15,743)	(13,984)
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	28,484	26,847
Noncontrolling interests	115	100
Total stockholders' deficit	28,599	26,947
Total liabilities and stockholders' deficit	12,856	12,963
Subsidiary Non-Guarantors [Member]
Current assets:
Cash and cash equivalents	317	300	323	258
Accounts receivable, net	2,443	2,224
Inventories	468	457
Deferred income taxes
Other	495	451
Total current assets	3,723	3,432
Property and equipment, net	5,855	5,768
Investments of insurance subsidiaries	402	515
Investments in and advances to affiliates	110	88
Goodwill and other intangible assets	4,137	3,842
Deferred loan costs
Other	339	179
Total assets	14,566	13,824
Current liabilities:
Accounts payable	569	565
Accrued salaries	451	482
Other accrued expenses	809	788
Long-term debt due within one year	39	36
Total current liabilities	1,868	1,871
Long-term debt	525	493
Intercompany balances	3,472	3,406
Professional liability risks	959	973
Income taxes and other liabilities	256	220
Total liabilities	7,080	6,963
Stockholders' (deficit) equity attributable to HCA Holdings, Inc.	6,269	5,642
Noncontrolling interests	1,217	1,219
Total stockholders' deficit	7,486	6,861
Total liabilities and stockholders' deficit	14,566	13,824
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	(19,784)	(18,481)
Goodwill and other intangible assets
Deferred loan costs
Other
Total assets	(19,784)	(18,481)
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.	(19,784)	(18,481)
Noncontrolling interests
Total stockholders' deficit	(19,784)	(18,481)
Total liabilities and stockholders' deficit	$ (19,784)	$ (18,481)