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Condensed Consolidated Comprehensive Income Statements - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 1,282	$ 777
Other comprehensive income (loss) before taxes:
Foreign currency translation	54	10
Unrealized gains (losses) on available-for-sale securities	(5)	3
Defined benefit plans	0	0
Pension costs included in salaries and benefits	5	5
Total defined benefit plans	5	5
Change in fair value of derivative financial instruments	35	3
Interest costs included in interest expense		7
Total change in fair value of derivative financial instruments	35	10
Other comprehensive income before taxes	89	28
Income taxes related to other comprehensive income items	8	10
Other comprehensive income	81	18
Comprehensive income	1,363	795
Comprehensive income attributable to noncontrolling interests	138	118
Comprehensive income attributable to HCA Healthcare, Inc.	$ 1,225	$ 677

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