Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020
($ in millions)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Management agreements	$	89	$	(51	)	$	38
Capitalized software		94	$	(51	)		43
	$	183	$	(102	)	$	81

	December 31, 2019
($ in millions)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Management agreements	$	88	$	(46	)	$	42
Capitalized software		73		(38	)		35
	$	161	$	(84	)	$	77

Schedule of Estimated Future Amortization Expense

As of December 31, 2020, we estimated our future amortization expense for our amortizing intangible assets to be as follows:

($ in millions)	Future Amortization Expense
Year
2021	$	23
2022		19
2023		12
2024		3
2025		3
Thereafter		21
	$	81