Goodwill And Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill And Other Intangibles [Abstract]

Components Of Other Intangibles

	2020						2019
	Gross				Net		Gross				Net
	Carrying		Accumulated		Carrying		Carrying		Accumulated		Carrying
($ in millions)	Amount		Amortization		Amount		Amount		Amortization		Amount
Other Intangibles:
Customer base	$	4,332	$	(3,781)	$	551	$	4,332	$	(3,452)	$	880
Trade name		122		-		122		122		-		122
Royalty agreement		72		(68)		4		72		(54)		18
Total other intangibles	$	4,526	$	(3,849)	$	677	$	4,526	$	(3,506)	$	1,020

Schedule Of Amortization Expense

	For the year ended December 31,
($ in millions)	2020		2019		2018
Amortization expense	$	343	$	445	$	569