Restructuring Charges (Tables)

12 Months Ended

Dec. 31, 2016

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Charges

	Year Ended December 31, 2016
			Other		Total
(Dollars in millions)	Severance		Restructuring		Severance and
2016 Plan	Charges		Charges		Other Charges
North America	$	38	$	58	$	96
MENA/Asia Pacific	29		4		33
Europe/SSA/Russia	27		9		36
Latin America	43		13		56
Subtotal	137		84		221
Land Drilling Rigs	7		—		7
Corporate and Research and Development	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
North America	$	28	$	24	$	52
MENA/Asia Pacific	21		35		56
Europe/SSA/Russia	34		22		56
Latin America	38		2		40
Subtotal	121		83		204
Land Drilling Rigs	12		—		12
Corporate and Research and Development	16		—		16
Total	$	149	$	83	$	232

	Year Ended December 31, 2014
			Other		Total
	Severance		Restructuring		Severance and
(Dollars in millions)	Charges		Charges		Other Charges
2014 Plan:
North America	$	17	$	27	$	44
MENA/Asia Pacific	19		106		125
Europe/SSA/Russia	17		13		30
Latin America	29		7		36
Subtotal	82		153		235
Land Drilling Rigs	5		4		9
Corporate and Research and Development	27		2		29
2014 Plan Total	$	114	$	159	$	273
2015 Plan:
North America	$	32	$	—	32
MENA/Asia Pacific	8		—		8
Europe/SSA/Russia	5		—		5
Latin America	12		—		12
Subtotal	57		—		57
Land Drilling Rigs	—		—		—
Corporate and Research and Development	1		—		1
2015 Plan Total	$	58	$	—	$	58
Total	$	172	$	159	$	331

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 2014 Plan and 2015 Plan that will be paid pursuant to the respective arrangements and statutory requirements.

	At December 31, 2016
	2016 Plan				2015 and 2014 Plans				Total
									Severance
	Severance		Other		Severance		Other		and Other
(Dollars in millions)	Liability		Liability		Liability		Liability		Liability
North America	$	8	$	16	$	2	$	1	$	27
MENA/Asia Pacific	6		4		1		1		12
Europe/SSA/Russia	7		2		—		7		16
Latin America	—		—		—		—		—
Subtotal	21		22		3		9		55
Land Drilling Rigs	1		—		—		—		1
Corporate and Research and Development	30		—		—		—		30
Total	$	52	$	22	$	3	$	9	$	86

The following table presents the restructuring accrual activity for the year ended December 31, 2016.

			Year Ended December 31, 2016
(Dollars in millions)	Accrued Balance at December 31, 2015		Charges		Cash Payments			Other			Accrued Balance at December 31, 2016
2016 Plan:
Severance liability	$	—	$	196	$	(147	)	$	3		$	52
Other restructuring liability	—		44		(18		)	(4		)	22
2015 and 2014 Plan:
Severance liability	37		—		(28		)	(6		)	3
Other restructuring liability	14		—		(5		)	—			9
Total severance and other restructuring liability	$	51	$	240	$	(198	)	$	(7	)	$	86