Restructuring And Other Charges (Tables)

12 Months Ended

Dec. 31, 2019

Restructuring And Other Charges [Abstract]

Changes In Restructuring Reserve

($ in millions)	Restructuring Liability
Balance at December 31, 2017	$	25
Severance costs		12
Transformation initiative costs		23
Cash payments during the period		(42	)
Balance at December 31, 2018		18
Severance costs		38
Transformation initiative costs		46
Other restructuring costs		40
Cash payments during the period		(127	)
Balance at December 31, 2019	$	15