Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Assets [Abstract]
Property and equipment at cost	$ 2,178	$ 2,139
Accumulated depreciation	(980)	(955)
Net property and equipment	1,198	1,184
Investment in qualified affordable housing projects	1,373	1,378
Nonmarketable equity investments	1,116	998
Goodwill	822	822	$ 343
Net deferred tax assets	625	254
Accrued interest, fees, and rent receivables	609	600
Restricted cash held for securitization trusts	583	516
Equity-method investments	544	472
Other accounts receivable	293	127
Net intangible assets	121	129
Operating lease right-of-use assets	111	148
Restricted cash and cash equivalents	100	92
Finance lease right-of-use assets	44	0
Other assets	1,418	1,337
Total other assets	$ 8,957	$ 8,057
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Total other assets	Total other assets