EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2019

Defined Benefit Plan [Abstract]

Schedule of Information Related to Stock-Based Awards by Grant Date

The table below shows certain stock option and restricted stock unit grants and other awards that comprise the stock-based compensation expense recorded in the year ended December 31, 2019. Compensation cost is measured by the fair value of the awards on their grant dates and is recognized over the requisite service period of the awards, whether or not the awards had any intrinsic value during the period.

Grant Date	Awards	Exercise Price Per Share		Fair Value Per Share at Grant Date		Stock-Based Compensation Expense for Year Ended December 31, 2019
	(In Thousands)					(In Millions)
Stock Options:
February 27, 2019	210	$	28.26	$	12.49	$	1
February 28, 2018	442	$	20.60	$	8.83	1
March 1, 2017	821	$	18.99	$	8.52	1
Restricted Stock Units:
July 9, 2019	94			$	18.55	1
May 3, 2019	100			$	16.18	2
February 27, 2019	800			$	28.26	9
January 31, 2019	318			$	21.99	2
June 28, 2018	51			$	34.61	1
March 29, 2018	293			$	24.25	4
February 28, 2018	204			$	20.60	2
March 1, 2017	383			$	18.99	2
August 25, 2014	456			$	59.90	3
Other grants						2
USPI Management Equity Plan						11
						$	42

Summary of Stock Option Activity

The following table summarizes stock option activity during the years ended December 31, 2019, 2018 and 2017:

	Options		Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value		Weighted Average Remaining Life
					(In Millions)
Outstanding at December 31, 2016	1,435,921		$	22.87
Granted	1,396,307		18.24
Exercised	(20,400	)	4.56
Forfeited/Expired	(247,006	)	24.37
Outstanding at December 31, 2017	2,564,822		$	20.35
Granted	635,196		21.33
Exercised	(619,849	)	18.19
Forfeited/Expired	(317,426	)	35.30
Outstanding at December 31, 2018	2,262,743		$	19.12
Granted	230,713		28.28
Exercised	(306,427	)	18.05
Forfeited/Expired	(226,037	)	20.21
Outstanding at December 31, 2019	1,960,992		$	20.24	$	35	6.1 years
Vested and expected to vest at December 31, 2019	1,960,992		$	20.24	$	35	6.1 years
Exercisable at December 31, 2019	454,360		$	17.26	$	9	2.7 years

Schedule of Assumptions Used to Determine Fair Value of Stock Options

These fair values were calculated based on each grant date, using a Monte Carlo simulation with the following assumptions:

	February 27,	February 28,
	2019	2018
Expected volatility	48%	46%
Expected dividend yield	0%	0%
Expected life	6.2 years	6.2 years
Expected forfeiture rate	0%	0%
Risk-free interest rate	2.53%	2.72%

Summary of Information About Stock Options by Range of Exercise Prices

The following table summarizes information about our outstanding stock options at December 31, 2019:

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number of Options	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Number of Options	Weighted Average Exercise Price
$16.43 to $19.759	1,224,289	5.2 years	$	18.14	408,526	$	16.43
$19.76 to $35.430	736,703	7.5 years	23.74		45,834	24.63
	1,960,992	6.1 years	$	20.24	454,360	$	17.26

Schedule of Stock Options by Monetary Status and Employment Status of the Awardees

As of December 31, 2019, 61.2% of all our outstanding options were held by current employees and 38.8% were held by former employees. Of our outstanding options, 100% were in-the-money, that is, they had exercise price less than the $38.03 market price of our common stock on December 31, 2019. There were no options out-of-the-money.

	In-the-Money Options				Out-of-the-Money Options				All Options
	Outstanding		% of Total		Outstanding		% of Total		Outstanding		% of Total
Current employees	1,199,274		61.2	%	—		—	%	1,199,274		61.2	%
Former employees	761,718		38.8	%	—		—	%	761,718		38.8	%
Totals	1,960,992		100.0	%	—		—	%	1,960,992		100.0	%
% of all outstanding options	100.0	%			—	%			100.0	%

Summary of Restricted Stock Unit Activity

The following table summarizes restricted stock unit activity during the years ended December 31, 2019, 2018 and 2017:

	Restricted Stock Units		Weighted Average Grant Date Fair Value Per Unit
Unvested at December 31, 2016	3,174,533		$	38.75
Granted	714,018		18.25
Vested	(1,397,953	)	35.50
Forfeited	(236,610	)	32.13
Unvested at December 31, 2017	2,253,988		$	35.20
Granted	765,184		24.74
Vested	(995,331	)	32.63
Forfeited	(139,711	)	36.01
Unvested at December 31, 2018	1,884,130		$	32.25
Granted	1,481,021		27.87
Vested	(1,562,191	)	36.45
Forfeited	(339,461	)	24.74
Unvested at December 31, 2019	1,463,499		$	25.08

Schedule of Employee Stock Purchase Plan Activity

We sold the following numbers of shares under our employee stock purchase plan in the years ended December 31, 2019, 2018 and 2017:

	Years Ended December 31,
	2019		2018		2017
Number of shares	215,422		228,045		395,957
Weighted average price	$	24.44	$	22.96	$	17.28

Schedule of Reconciliation of Funded Status of Plans, the Amounts included in the Consolidated Balance Sheets and Assumptions Used for Projected Benefit Obligations

The following tables summarize the balance sheet impact, as well as the benefit obligations, funded status and rate assumptions associated with the SERPs and the DMC Pension Plan based on actuarial valuations prepared as of December 31, 2019 and 2018:

	December 31,
	2019			2018
Reconciliation of funded status of plans and the amounts included in the Consolidated Balance Sheets:
Projected benefit obligations(1)
Beginning obligations	$	(1,301	)	$	(1,455	)
Service cost	—			(2		)
Interest cost	(58		)	(56		)
Actuarial gain (loss)	(132		)	90
Benefits paid	123			122
Special termination benefit costs	(1		)	—
Ending obligations	(1,369		)	(1,301		)
Fair value of plans assets
Beginning plan assets	731			850
Gain (loss) on plan assets	128			(65		)
Employer contribution	33			47
Benefits paid	(102		)	(101		)
Ending plan assets	790			731
Funded status of plans	$	(579	)	$	(570	)
Amounts recognized in the Consolidated Balance Sheets consist of:
Other current liability	$	(19	)	$	(49	)
Other long-term liability	$	(560	)	$	(521	)
Accumulated other comprehensive loss	$	323		$	281
SERP Assumptions:
Discount rate	3.50		%	4.50		%
Compensation increase rate	3.00		%	3.00		%
Measurement date	December 31, 2019			December 31, 2018
DMC Pension Plan Assumptions:
Discount rate	3.60		%	4.62		%
Compensation increase rate	Frozen			Frozen
Measurement date	December 31, 2019			December 31, 2018

(1) The accumulated benefit obligation at December 31, 2019 and 2018 was approximately $1.367 billion and $1.299 billion, respectively.

Schedule of Components of Net Benefit Costs and Assumptions Used for Net Periodic Benefit Costs

The components of net periodic benefit costs and related assumptions are as follows:

	Years Ended December 31,
	2019			2018			2017
Service costs	$	—		$	2		$	2
Interest costs	58			56			62
Expected return on plan assets	(46		)	(54		)	(50		)
Amortization of net actuarial loss	10			14			14
Special termination benefit costs	1			—			—
Net periodic benefit cost	$	23		$	18		$	28
SERP Assumptions:
Discount rate	4.50		%	3.75		%	4.25		%
Long-term rate of return on assets	n/a			n/a			n/a
Compensation increase rate	3.00		%	3.00		%	3.00		%
Measurement date	January 1, 2019			January 1, 2018			January 1, 2017
Census date	January 1, 2019			January 1, 2018			January 1, 2017
DMC Pension Plan Assumptions:
Discount rate	4.62		%	4.00		%	4.42		%
Long-term rate of return on assets	6.50		%	6.50		%	6.50		%
Compensation increase rate	Frozen			Frozen			Frozen
Measurement date	January 1, 2019			January 1, 2018			January 1, 2017
Census date	January 1, 2019			January 1, 2018			January 1, 2017

Schedule of Weighted-Average Asset Allocations by Asset Category

The weighted-average asset allocations by asset category as of December 31, 2019, were as follows:

Asset Category	Target		Actual
Cash and cash equivalents	2	%	2	%
U.S. government obligations	—	%	2	%
Equity securities	65	%	64	%
Debt securities	33	%	32	%
Alternative investments	—	%	—	%

Summary of DMC Pension Plan Assets Measured at Fair Value on a Recurring Basis Aggregated by the Level in the Fair Value Hierarchy

The following tables summarize the DMC Pension Plan assets measured at fair value on a recurring basis as of December 31, 2019 and 2018, aggregated by the level in the fair value hierarchy within which those measurements are determined. In general, fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities. We consider a security that trades at least weekly to have an active market. Fair values determined by Level 2 inputs utilize data points that are observable, such as quoted prices for similar assets, interest rates and yield curves. Fair values determined by Level 3 inputs are unobservable data points for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability.

	December 31, 2019		Level 1		Level 2		Level 3
Cash and cash equivalents	$	37	$	37	$	—	$	—
U.S. government obligations	9		9		—		—
Equity securities	461		461		—		—
Fixed income funds	283		283		—		—
Futures contracts	—		—		—		—
	$	790	$	790	$	—	$	—

	December 31, 2018		Level 1		Level 2		Level 3
Cash and cash equivalents	$	33	$	33	$	—	$	—
U.S. government obligations	9		9		—		—
Equity securities	423		423		—		—
Fixed income funds	262		262		—		—
Futures contracts	$	4	$	4
	$	731	$	731	$	—	$	—

Schedule of Estimated Future Benefit Payments

The following table presents the estimated future benefit payments to be made from the SERPs and the DMC Pension Plan, a portion of which will be funded from plan assets, for the next five years and in the aggregate for the five years thereafter:

			Years Ending December 31,										Five Years
	Total		2020		2021		2022		2023		2024		Thereafter
Estimated benefit payments	$	876	$	85	$	87	$	89	$	89	$	90	$	436