Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
DTAs:
ALLL	$ 1,033	$ 1,376
Employee compensation and benefits	819	698
Loans	53	369
Operating lease liability	389	469
Accruals and reserves	245	305
Federal and state NOLs and other carryforwards	113	149
Net unrealized losses in AOCI	488	0
Other	59	57
Total gross DTAs	3,199	3,423
Deferred Tax Assets, Valuation Allowance	(105)	(123)
Deferred Tax Assets, Net of Valuation Allowance, Total	3,094	3,300
DTLs:
Pension	1,416	1,299
Goodwill and other intangible assets	630	688
Equipment and auto leasing	465	599
MSRs	360	459
ROU assets	280	327
Net unrealized gains in AOCI	0	222
Other	173	279
Total DTLs	3,324	3,873
Net DTL	$ (230)	$ (573)