Revenue (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue disaggregated by primary region and products of revenue recognition

In the following tables, revenue is disaggregated by primary region and products of revenue recognition.

Net Sales by Region

(Dollars in millions)	Three Months Ended September 30, 2018						Three Months Ended September 30, 2017
	Electronics		Brake Systems		Total		Electronics		Brake Systems		Total
Asia	$	98	$	85	$	183	$	114	$	89	$	203
Americas	166		15		181		166		29		195
Europe	163		—		163		170		—		170
Total region sales	426		100		526		449		118		567
Less: intercompany sales	—		—		—		—		—		—
Total	$	426	$	100	$	526	$	449	$	118	$	567

Net Sales by Region

(Dollars in millions)	Nine Months Ended September 30, 2018						Nine Months Ended September 30, 2017
	Electronics		Brake Systems		Total		Electronics		Brake Systems			Total
Asia	$	314	$	280	$	594	$	353	$	264		$	617
Americas	517		45		562		525		98			624
Europe	537		—		537		491		—			491
Total region sales	1,367		325		1,692		1,369		363			1,732
Less: intercompany sales	—		—		—		—		(2		)	(3		)
Total	$	1,367	$	325	$	1,692	$	1,369	$	361		$	1,729

Net Sales by Products

(Dollars in millions)	Three Months Ended September 30, 2018						Three Months Ended September 30, 2017
	Electronics		Brake Systems		Total		Electronics		Brake Systems		Total
Restraint Control Systems	$	226	$	—	$	226	$	251	$	—	$	251
Active Safety products	201		—		201		198		—		198
Brake Systems	—		100		100		—		118		118
Total product sales	426		100		526		449		118		567
Less: intercompany sales	—		—		—		—		—		—
Total net sales	$	426	$	100	$	526	$	449	$	118	$	567

Net Sales by Products

(Dollars in millions)	Nine Months Ended September 30, 2018						Nine Months Ended September 30, 2017
	Electronics		Brake Systems		Total		Electronics		Brake Systems			Total
Restraint Control Systems	$	739	$	—	$	739	$	788	$	—		$	788
Active Safety products	628		—		628		581		—			581
Brake Systems	—		325		325		—		363			363
Total product sales	1,367		325		1,692		1,369		363			1,732
Less: intercompany sales	—		—		—		—		(2		)	(3		)
Total net sales	$	1,367	$	325	$	1,692	$	1,369	$	361		$	1,729

Summary of information about receivables and contract assets from contracts with customers

The following tables provide information about receivables and contract assets from contracts with customers.

Contract Balances with Customers

(Dollars in millions)	As of
	September 30, 2018		December 31, 2017
Receivables, net	$	437	$	460
Contract assets1	8		—

¹ Included in prepaid expenses and contract assets

Receivables, net of allowance

(Dollars in millions)	As of
	September 30, 2018			December 31, 2017
Receivables	$	440		$	462
Allowance at beginning of period	(2		)	(4		)
Net decrease/(increase) of allowance	(1		)	2
Allowance at end of period	(3		)	(2		)
Receivables, net of allowance	$	437		$	460

Summary of changes in contract assets

Changes in the contract asset balances during the period are as follows:

Change in Contract Balances with Customers¹ 

(Dollars in millions)	Three months ended September 30, 2018			Nine months ended September 30, 2018
	Contract assets			Contract assets
Beginning balance	$	7		$	—
Increases due to cumulative catch up adjustment	1			8
Increases due to revenue recognized	8			23
Decreases due to transfer to receivables	(8		)	(23		)
Ending balance	$	8		$	8

¹ The contract asset is determined at each period end, this table reflects the rollforward of the period end balance.