SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2017, 2016, and 2015

(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:
2017	$	118		$	—		$	20		$	(10	)	$	(32	)	$	96
2016	101			—			39			19			(41		)	118
2015	137			(39		)	61			(7		)	(51		)	101
Deferred tax asset valuation allowance:
2017	(49		)	—			—			—			—			(49		)
2016	(42		)	—			(7		)	—			—			(49		)
2015	(48		)	—			6			—			—			(42		)

(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.