Revenue from Contracts With Customers (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer

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

	Three Months Ended September 30,						Nine Months Ended September 30,
($ in millions)	Point in Time		Over Time		Total		Point in Time		Over Time		Total
2021	$	603	$	2,950	$	3,553	$	1,837	$	8,300	$	10,137
2020		604		2,489		3,093		1,638		7,041		8,679

Schedule of balances of contract liabilities

	Contract		Contract
	Liabilities		Liabilities
($ in millions)	(Current)		(Noncurrent)
Balance at December 31, 2020	$	108	$	29
Increase (decrease)		118		6
Balance at September 30, 2021	$	226	$	35

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 September 30, 2021	$	1,398	$	1,290	$	2,688