Restructuring Charges (Tables)

12 Months Ended

Dec. 31, 2017

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Charges

	Year Ended December 31, 2017
			Other		Total
(Dollars in millions)	Severance		Restructuring		Severance and
2016-17 Plan	Charges		Charges		Other Charges
Western Hemisphere	$	42	$	28	$	70
Eastern Hemisphere	35		42		77
Corporate	32		4		36
Total	$	109	$	74	$	183

	Year Ended December 31, 2016
			Other		Total
(Dollars in millions)	Severance		Restructuring		Severance and
2016 Plan	Charges		Charges		Other Charges
Western Hemisphere	$	82	$	71	$	153
Eastern Hemisphere	62		13		75
Corporate	52		—		52
Total	$	196	$	84	$	280

	Year Ended December 31, 2015
			Other		Total
(Dollars in millions)	Severance		Restructuring		Severance and
2015 Plan:	Charges		Charges		Other Charges
Western Hemisphere	$	68	$	26	$	94
Eastern Hemisphere	66		57		123
Corporate	15		—		15
Total	$	149	$	83	$	232

Schedule of Restructuring Reserve by Type of Cost

The severance and other restructuring charges gave rise to certain liabilities, the components of which are summarized below, and largely relate to the severance accrued as part of the 2016-17 Plan, the 2016 Plan and the 2015 Plan that will be paid pursuant to the respective arrangements and statutory requirements.

	At December 31, 2017
	2016-17 and 2016 Plans				2015 Plan				Total
									Severance
	Severance		Other		Severance		Other		and Other
(Dollars in millions)	Liability		Liability		Liability		Liability		Liability
Western Hemisphere	$	4	$	17	$	—	$	—	$	21
Eastern Hemisphere	7		18		—		5		30
Corporate	10		—		—		—		10
Total	$	21	$	35	$	—	$	5	$	61

The following table presents the restructuring accrual activity for the year ended December 31, 2017.

			Year Ended December 31, 2017
(Dollars in millions)	Accrued Balance at December 31, 2016		Charges		Cash Payments			Other			Accrued Balance at December 31, 2017
2016-17 and 2016 Plans:
Severance liability	$	52	$	109	$	(137	)	$	(3	)	$	21
Other restructuring liability	22		62		(26		)	(23		)	35
2015 Plan:
Severance liability	3		—		(3		)	—			—
Other restructuring liability	9		—		(1		)	(3		)	5
Total severance and other restructuring liability	$	86	$	171	$	(167	)	$	(29	)	$	61