Revenue from Contracts With Customers (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer

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

	Three Months Ended March 31,
($ in millions)	Point in Time		Over Time		Total
2021	$	610	$	2,515	$	3,125
2020		503		2,282		2,785

Schedule of balances of contract liabilities

	Contract		Contract
	Liabilities		Liabilities
($ in millions)	(Current)		(Noncurrent)
Balance at December 31, 2020	$	108	$	29
Increase (decrease)		(19)		(1)
Balance at March 31, 2021	$	89	$	28

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, 2021	$	1,387	$	746	$	2,133