Income Taxes - Net Deferred Tax Position (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Allowance for credit losses	$ 150	$ 245
Accrued expenses	64	108
Interests in real estate mortgage investment conduits	127	158
Unrealized losses on investment securities	21	0
Capitalized costs	495	501
Lease liabilities	111	152
Other	219	268
Total deferred tax assets	1,187	1,432
Deferred tax liabilities:
Lease ROU assets	80	127
Unrealized gains on investment securities	0	237
Amortization of intangible assets	21	19
Fair value adjustments	43	1
Other	14	37
Total deferred tax liabilities	158	421
Net deferred tax asset	$ 1,029	$ 1,011