Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Total net benefit plan expense (income)

Total net benefit plan expense (income) associated with the Company’s defined benefit pension and postretirement benefit plans consisted of the following:

	Pension Benefits									Postretirement Benefits
(dollars in millions)	2015			2014			2013			2015			2014			2013
Service cost	$	8		$	18		$	10		$	—		$	—		$	—
Interest cost	15			20			17			—			—			—
Expected return on plan assets	(23		)	(27		)	(21		)	—			—			—
Amortization of prior service credits	(2		)	(2		)	(2		)	(1		)	(1		)	(1		)
Amortization of losses (gains)	9			9			8			(1		)	(1		)	(1		)
Curtailment gain	—			(12		)	—			—			—			—
Settlement loss	1			4			—			—			—			—
Total net benefit plan expense (income)	$	8		$	10		$	12		$	(2	)	$	(2	)	$	(2	)

Schedule of net periodic benefit cost not yet recognized

Included in accumulated other elements of comprehensive income (loss) at December 31, 2015 and 2014 are the following amounts that have not yet been recognized in net periodic benefit plan cost, as well as the amounts that are expected to be recognized in net periodic benefit plan cost during the year ending December 31, 2016:

	December 31, 2015						December 31, 2014						Year ending December 31, 2016
(dollars in millions)	Before Tax			After Tax			Before Tax			After Tax			Expected Amortization
Pension benefits:
Prior service credits	$	15		$	14		$	19		$	15		$	(2	)
Actuarial losses, net	(131		)	(116		)	(164		)	(132		)	9
Postretirement benefits:
Prior service credits	2			1			3			2			(1		)
Actuarial gains	7			4			8			5			(1		)
	$	(107	)	$	(97	)	$	(134	)	$	(110	)	$	5

Schedule of changes in benefit obligations

The change in the projected benefit obligation associated with the Company’s defined benefit pension plans and the change in the accumulated benefit obligation associated with the Company’s postretirement benefit plans was as follows:

	Pension Benefits						Postretirement Benefits
(dollars in millions)	2015			2014			2015			2014
Benefit obligation at beginning of year	$	509		$	489		$	9		$	11
Service cost	8			18			—			—
Interest cost	15			20			—			—
Plan participants’ contributions	1			1			—			—
Actuarial losses (gains)	3			78			1			(1		)
Exchange rate changes	(29		)	(52		)	—			—
Benefit payments	(12		)	(14		)	(1		)	(1		)
Curtailments	—			(23		)	—			—
Settlements	(59		)	(8		)	—			—
Benefit obligation at end of year	$	436		$	509		$	9		$	9

Schedule of changes in fair value of plan assets

The change in the plan assets associated with the Company’s defined benefit pension and postretirement benefit plans was as follows:

	Pension Benefits						Postretirement Benefits
(dollars in millions)	2015			2014			2015			2014
Fair value of plan assets at beginning of year	$	455		$	432		$	—		$	—
Actual return on plan assets	11			53			—			—
Company contributions	14			27			1			1
Plan participants’ contributions	1			1			—			—
Exchange rate changes	(24		)	(40		)	—			—
Benefit payments	(12		)	(14		)	(1		)	(1		)
Settlements	(59		)	(8		)	—			—
Other	(2		)	4			—			—
Fair value of plan assets at end of year	$	384		$	455		$	—		$	—

Status of underfunded defined benefit pension and postretirement benefit plans

The status of the Company’s underfunded defined benefit pension and postretirement benefit plans was as follows:

	Pension Benefits December 31,						Postretirement Benefits December 31,
(dollars in millions)	2015			2014			2015			2014
Noncurrent assets	$	20		$	—		$	—		$	—
Current liabilities	(1		)	(1		)	(2		)	(1		)
Non-current liabilities	(71		)	(53		)	(7		)	(8		)
Underfunded status at end of year	$	(52	)	$	(54	)	$	(9	)	$	(9	)

Schedule of actual asset investment allocations

Actual asset investment allocations for the Company’s main defined benefit pension plan in the United Kingdom, which accounts for approximately 89% of total plan assets, were as follows:

	2015		2014		2013
U.K. plan:
Equity securities	33	%	55	%	60	%
Fixed income debt securities, cash and other	67	%	45	%	40	%

Schedule of fair values of plan assets

The fair values of the Company’s pension plan assets by asset category at December 31, 2015 and 2014 were as follows:

	Fair Value Based on Quoted Prices in Active  Markets for Identical Assets (Level 1)				Fair Value Based on Significant Other Observable Inputs (Level 2)				Fair Value Based on Significant Unobservable Inputs (Level 3)				Total
(dollars in millions)	2015		2014		2015		2014		2015		2014		2015		2014
Cash and cash equivalents	$	1	$	1	$	—	$	—	$	—	$	—	$	1	$	1
Equity securities:
U.S. equities	—		—		78		83		—		—		78		83
Non-U.S. equities	—		—		120		120		—		—		120		120
Bonds:
Non-U.S. government bonds	—		—		114		117		—		—		114		117
Non-U.S. corporate bonds	—		—		29		30		—		—		29		30
Alternative investments:
Insurance contracts	—		—		—		—		28		89		28		89
Real estate and other	—		—		—		—		14		15		14		15
Total assets	$	1	$	1	$	341	$	350	$	42	$	104	$	384	$	455

Changes in the fair value of pension plan assets determined based on level 3 unobservable inputs

Changes in the fair value of pension plan assets determined based on level 3 unobservable inputs were as follows:

	Year Ended December 31,
(dollars in millions)	2015			2014
Balance at beginning of the year	$	104		$	105
Purchases/sales, net	(56		)	10
Actual return on plan assets	(2		)	4
Currency impact	(4		)	(15		)
Balance at end of the year	$	42		$	104

Weighted-average assumptions associated with defined benefit pension and postretirement benefit plans

The weighted-average assumptions associated with the Company’s defined benefit pension and postretirement benefit plans were as follows:

	Pension Benefits				Postretirement Benefits
	2015		2014		2015		2014
Assumptions related to net benefit costs:
U.S. plans:
Discount rate	3.25	%	3.75	%	3.25	%	3.75	%
Measurement date	1/1/2015		1/1/2014		1/1/2015		1/1/2014
Foreign plans:
Discount rate	2.25-4.25%		3.5-5.25%		—		—
Expected return on plan assets	2.25-6.25%		2.25-6.75%		—		—
Rate of compensation increase	2.25-5.00%		2.25-4.50%		—		—
Measurement date	1/1/2015		1/1/2014		—		—
Assumptions related to end-of-period benefit obligations:
U.S. plans:
Discount rate	3.50	%	3.25	%	3.50	%	3.25	%
Health care cost trend rate	—		—		7.00	%	7.00	%
Measurement date	12/31/2015		12/31/2014		12/31/2015		12/31/2014
Foreign plans:
Discount rate	2.25-4.25%		2.25-4.25%		—		—
Rate of compensation increase	2.25-4.00%		2.25-5.00%		—		—
Measurement date	12/31/2015		12/31/2014		—		—

Projected benefit obligations in excess of plan assets and accumulated benefit obligations in excess of plan assets

Amounts applicable to the Company’s pension plans with projected benefit obligations in excess of plan assets and accumulated benefit obligations in excess of plan assets were as follows:

	Projected Benefit Obligation in Excess of Plan Assets at December 31,				Accumulated Benefit Obligation in Excess of Plan Assets at December 31,
(dollars in millions)	2015		2014		2015		2014
Fair value of applicable plan assets	$	41	$	101	$	41	$	101
Projected benefit obligation of applicable plans	$	113	$	171	—		—
Accumulated benefit obligation of applicable plans	—		—		$	86	$	149

Future expected benefit payments

Future expected benefit payments are as follows:

(dollars in millions)	Pension Benefits		Postretirement Benefits
Year ending December 31:
2016	$	11	$	1
2017	$	11	$	1
2018	$	12	$	1
2019	$	13	$	1
2020	$	13	$	1
2021 - 2025	$	71	$	3