Goodwill And Other Intangibles (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill And Other Intangibles [Abstract]

Components Of Other Intangibles

	March 31, 2018						December 31, 2017
	Gross Carrying		Accumulated		Net Carrying		Gross Carrying		Accumulated		Net Carrying
($ in millions)	Amount		Amortization		Amount		Amount		Amortization		Amount
Other Intangibles:
Customer base	$	5,188	$	(3,450)	$	1,738	$	5,188	$	(3,294)	$	1,894
Trade name		122		-		122		122		-		122
Royalty agreement		72		(29)		43		72		(25)		47
Total other intangibles	$	5,382	$	(3,479)	$	1,903	$	5,382	$	(3,319)	$	2,063

Amortization Expense

	For the three months ended March 31,
($ in millions)	2018		2017
Amortization expense	$	160	$	203