Securitizations and Variable Interest Entities, Transactions with Consolidated VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2022		Dec. 31, 2021		Sep. 30, 2021
Variable Interest Entity [Line Items]
Assets	$ 1,877,745	[1]	$ 1,948,068	[1]	$ 1,954,901
Total loans	945,906		895,394		$ 862,827
Long-term debt	(156,412)		(160,689)
Carrying value [Member]
Variable Interest Entity [Line Items]
Long-term debt	(155,634)		(160,660)
VIEs that we consolidate [Member]
Variable Interest Entity [Line Items]
Assets	7,140		7,529
VIEs that we consolidate [Member] | Commercial and industrial loans and leases [Member]
Variable Interest Entity [Line Items]
Assets	7,068		7,013
VIEs that we consolidate [Member] | Other [Member]
Variable Interest Entity [Line Items]
Assets	72		516
VIEs that we consolidate [Member] | Carrying value [Member]
Variable Interest Entity [Line Items]
Assets	4,800		4,800
Total loans	4,585		4,476
Debt securities	71		71
All other assets	172		234
Long-term debt	0		(149)
All other liabilities	(235)		(259)
VIEs that we consolidate [Member] | Carrying value [Member] | Commercial and industrial loans and leases [Member]
Variable Interest Entity [Line Items]
Total loans	4,585		4,099
Debt securities	0		0
All other assets	171		231
Long-term debt	0		0
All other liabilities	(163)		(188)
VIEs that we consolidate [Member] | Carrying value [Member] | Other [Member]
Variable Interest Entity [Line Items]
Total loans	0		377
Debt securities	71		71
All other assets	1		3
Long-term debt	0		(149)
All other liabilities	$ (72)		$ (71)

[1] Our consolidated assets at September 30, 2022, and December 31, 2021, included the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Debt securities, $71 million and $71 million; Loans, $4.6 billion and $4.5 billion; All other assets, $172 million and $234 million; and Total assets, $4.8 billion and $4.8 billion, respectively.