Restructuring Charges (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Charges

	Year Ended December 31, 2018
			Other		Total
(Dollars in millions)	Severance		Restructuring		Severance and
Transformation Plan	Charges		Charges		Other Charges
Western Hemisphere	$	21	$	6	$	27
Eastern Hemisphere	30		15		45
Corporate	10		44		54
Total	$	61	$	65	$	126

	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

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 liabilities accrued as part of the Transformation Plan, the 2016-17 and 2016 Plans that will be paid pursuant to the respective arrangements and statutory requirements.

	Balance at December 31, 2018
	Transformation Plan				2016-17 and 2016 Plans				Total
									Severance
	Severance		Other		Severance		Other		and Other
(Dollars in millions)	Liability		Liability		Liability		Liability		Liability
Western Hemisphere	$	6	$	—	$	3	$	7	$	16
Eastern Hemisphere	10		—		2		12		24
Corporate	2		16		1		—		19
Total	$	18	$	16	$	6	$	19	$	59

The following tables present the restructuring accrual activity for the year ended December 31, 2018, 2017 and 2016.

			Year Ended December 31, 2018
(Dollars in millions)	Accrued Balance at December 31, 2017		Charges		Cash Payments			Other			Accrued Balance at December 31, 2018
Transformation Plan
Severance liability	$	—	$	61	$	(35	)	$	(8	)	$	18
Other restructuring liability	—		59		(43		)	—			16
2016-17 and Prior Plans
Severance liability	21		—		(15		)	—			6
Other restructuring liability	40		—		(16		)	(5		)	19
Total severance and other restructuring liability	$	61	$	120	$	(109	)	$	(13	)	$	59
	Balance at Beginning of Period		Charges		Cash Payments			Other			Balance at End of Period
Year Ended December 31, 2017:
Severance and restructuring liability	$	86	$	171	$	(167	)	$	(29	)	$	61
Year Ended December 31, 2016:
Severance and restructuring liability	$	51	$	240	$	(198	)	$	(7	)	$	86