Revenue from Contracts With Customers (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer

Schedule of the disaggregation of revenue by timing of transfer of control

	Three Months Ended March 31, 2019						Three Months Ended March 31, 2018
($ in millions)	Point in Time		Over Time		Total		Point in Time		Over Time		Total
Total net sales	$	557	$	2,228	$	2,785	$	662	$	2,123	$	2,785

Schedule of balances of contract liabilities

	Contracts		Contract
	Liabilities		Liabilities
($ in millions)	(Current)		(Noncurrent)
Balance at December 31, 2017	$	45	$	—
Increase		—		8
Balance at December 31, 2018	$	45	$	8
Increase		12		2
Balance at March 31, 2019	$	57	$	10

Schedule of transaction price allocated to remaining performance obligations

($ in millions)	Next Twelve Months		Thereafter		Total
Sales expected to be recognized on multi-year contracts in place as of March 31, 2019	$	1,230	$	842	$	2,072