SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2018, 2017, and 2016

(in millions)

						Additions
	Balance  at Beginning of Period			Acquired/(Disposed) Balances		Charged (Credited)  to Costs and Expenses			Charged  to Other Accounts (1)			Deductions or Write-offs			Balance at End  of Period
Allowance for loss on receivables:
2018	$	96		$	—	$	36		$	(29	)	$	(24	)	$	79
2017	118			—		20			(10		)	(32		)	96
2016	101			—		39			19			(41		)	118
Deferred tax asset valuation allowance:
2018	(49		)	—		(5		)	—			—			(54		)
2017	(49		)	—		—			—			—			(49		)
2016	(42		)	—		(7		)	—			—			(49		)

(1) Represents changes in retroactive membership adjustments to premiums revenue and contractual allowances adjustments to services revenue as more fully described in Note 2 to the consolidated financial statements included in this annual report on Form 10-K.