Properties and Equipment, Net (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 677	$ 801
Accumulated depreciation and amortization	[1]	(533)	(624)
Properties and equipment, net		144	177
Depreciation and amortization		34	43	$ 44
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		5	8
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	543	642
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	[1]	129	$ 151
Retail branch properties [Member] | Corporate Center [Member]
Property, Plant and Equipment [Line Items]
Gain on sale of certain owned retail branch properties		$ 18

[1] Decreases since December 31, 2019 are due primarily to the retirement of assets associated with certain branches and office space which we exited in 2020 as part of our Restructuring Plan. See Note 3, "Strategic Initiatives," for further discussion. During 2020, we also recognized $18 million of gains on sales of certain owned retail branch properties. These gains are reflected in other income in the consolidated statement of income (loss) and were reported in the Corporate Center business segment.