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

(Tabular dollars in millions)

Col. A	Col. B			Col. C											Col. D			Col. E
Description	Balance at Beginning of Period			Balance Acquired through Acquisitions			Charged to Costs and Expenses				Charged to Other Accounts				Deductions			Balance at End of Period
Allowance for doubtful accounts:
Year ended December 31, 2017		$	60		$	1		$	5			$	—			$	17		$	49
Year ended December 31, 2016		$	59		$	1		$	12			$	—			$	12		$	60
Year ended December 31, 2015		$	47		$	—		$	9			$	15	(a)		$	12		$	59
Valuation allowance on deferred tax assets:
Year ended December 31, 2017		$	928		$	218		$	143			$	—			$	315		$	974
Year ended December 31, 2016		$	914		$	—		$	41			$	—			$	27		$	928
Year ended December 31, 2015		$	574		$	—		$	394	(b)		$	—			$	54		$	914
Reserves for inventory obsolescence:
Year ended December 31, 2017		$	19		$	1		$	6			$	—			$	7		$	19
Year ended December 31, 2016		$	23		$	1		$	2			$	—			$	7		$	19
Year ended December 31, 2015		$	30		$	—		$	10			$	—			$	17		$	23

(a) Reclassification from long-term to current.

(b) Primarily relates to a valuation allowance for a U.S. capital loss carryforward deferred tax asset that arose from the sale of internet businesses in China.