LIMITED POWER OF ATTORNEY FOR SEC REPORTING OBLIGATIONS

	KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned hereby makes,
constitutes and appoints Robert A. Waterman, John M. Franck II and Natalie
Harrison Cline as the undersigned's true and lawful attorneys-in-fact, with full
power and authority as hereinafter described on behalf of and in the name, place
and stead of the undersigned to:

	(1)	prepare, execute, acknowledge, deliver and file a Form ID (including any
amendments or authentications thereto) with respect to obtaining EDGAR codes,
with the U.S. Securities and Exchange Commission;

	(2)	prepare, execute, acknowledge, deliver and file Forms 3, 4 and 5 (including
any amendments thereto) with respect to the securities of HCA Inc., a Delaware
corporation (the "Company"), with the U.S. Securities and Exchange Commission,
any national securities exchanges and the Company, as considered necessary or
advisable under Section 16(a) of the Securities Exchange Act of 1934 and the
rules and regulations promulgated thereunder, as amended from time to time (the
"Exchange Act");

	(3)	seek or obtain, as the undersigned's representative and on the
undersigned's behalf, information on transactions in the Company's securities
from any third party, including brokers, employee benefit plan administrators
and trustees, and the undersigned hereby authorizes any such person to release
any such information to the undersigned and approves and ratifies any such
release of information; and

	(4)	perform any and all other acts which in the discretion of such
attorneys-in-fact are necessary or desirable for and on behalf of the
undersigned in connection with the foregoing.

	The undersigned acknowledges that:

	(1)	this Power of Attorney authorizes, but does not require, such
attorneys-in-fact to act in their discretion on information provided to such
attorneys-in-fact without independent verification of such information;

	(2)	any documents prepared and/or executed by such attorneys-in-fact on behalf
of the undersigned pursuant to this Power of Attorney will be in such form and
will contain such information and disclosure as such attorney-in-fact, in his or
her discretion, deems necessary or desirable;

	(3)	neither the Company nor such attorneys-in-fact assumes (i) any liability
for the undersigned's responsibility to comply with the requirements of the
Exchange Act, (ii) any liability of the undersigned for any failure to comply
with such requirements, or (iii) any obligation or liability of the undersigned
for profit disgorgement under Section 16(b) of the Exchange Act; and

	(4)	this Power of Attorney does not relieve the undersigned from responsibility
for compliance with the undersigned's obligations under the Exchange Act,
including without limitation the reporting requirements under Section 16 of the
Exchange Act.

	The undersigned hereby gives and grants the foregoing attorneys-in-fact full
power and authority to do and perform all and every act and thing whatsoever
requisite, necessary or appropriate to be done in and about the foregoing
matters as fully to all intents and purposes as the undersigned might or could
do if present, with full power of substitution and revocation, hereby ratifying
all that such attorney-in-fact, or such attorney-in-fact's substitute or
substitutes, of, for and on behalf of the undersigned, shall lawfully do or
cause to be done by virtue of this Power of Attorney.

	This Power of Attorney shall remain in full force and effect until revoked by
the undersigned in a signed writing delivered to such attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 21st day of April, 2008.

                                           /s/R. Milton Johnson