Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Related Amortization Expense

Intangible assets and related amortization expense were as follows:

	December 31, 2019
($ in millions)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Management agreements	$	88	$	(46	)	$	42
Capitalized software		95		(48	)		47
	$	183	$	(94	)	$	89

	December 31, 2018
($ in millions)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Management agreements	$	88	$	(41	)	$	47
Capitalized software		71		(37	)		34
	$	159	$	(78	)	$	81

Schedule of Estimated Future Amortization Expense

As of December 31, 2019, we estimated our future amortization expense for our amortizing intangible assets to be as follows:

($ in millions)	Future Amortization Expense
Year
2020	$	25
2021		21
2022		13
2023		3
2024		3
Thereafter		24
	$	89