Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 311,323	$ 312,331
Commercial Portfolio
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	13,945	33,735
2022	27,063	11,096
2021	7,055	4,458
2020	3,049	4,152
2019	2,448	2,781
Prior	6,808	6,814
Total Term Loans	60,368	63,036
Revolving Loans	30,973	31,594
Revolving Loans Converted to Term	211	46
Total	91,552	94,676
Commercial Portfolio | Commercial and multifamily real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	5,853	10,442
2022	8,981	4,484
2021	2,323	1,363
2020	750	2,096
2019	1,326	1,601
Prior	3,446	4,075
Total Term Loans	22,679	24,061
Revolving Loans	13,337	13,367
Revolving Loans Converted to Term	25	25
Total	36,041	37,453
Commercial Portfolio | Commercial and multifamily real estate | Noncriticized
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	5,154	9,527
2022	7,819	4,086
2021	2,037	1,161
2020	608	1,671
2019	965	1,280
Prior	2,536	2,898
Total Term Loans	19,119	20,623
Revolving Loans	13,317	13,254
Revolving Loans Converted to Term	25	25
Total	32,461	33,902
Commercial Portfolio | Commercial and multifamily real estate | Criticized | Criticized performing
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	669	814
2022	1,098	376
2021	265	202
2020	142	412
2019	331	302
Prior	639	1,061
Total Term Loans	3,144	3,167
Revolving Loans	20	113
Revolving Loans Converted to Term	0	0
Total	3,164	3,280
Commercial Portfolio | Commercial and multifamily real estate | Criticized | Criticized nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	30	101
2022	64	22
2021	21	0
2020	0	13
2019	30	19
Prior	271	116
Total Term Loans	416	271
Revolving Loans	0	0
Revolving Loans Converted to Term	0	0
Total	416	271
Commercial Portfolio | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	8,092	23,293
2022	18,082	6,612
2021	4,732	3,095
2020	2,299	2,056
2019	1,122	1,180
Prior	3,362	2,739
Total Term Loans	37,689	38,975
Revolving Loans	17,636	18,227
Revolving Loans Converted to Term	186	21
Total	55,511	57,223
Commercial Portfolio | Commercial and industrial | Noncriticized
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	7,677	22,105
2022	17,297	6,031
2021	4,359	2,934
2020	2,223	1,809
2019	717	973
Prior	2,935	2,658
Total Term Loans	35,208	36,510
Revolving Loans	16,728	17,187
Revolving Loans Converted to Term	186	21
Total	52,122	53,718
Commercial Portfolio | Commercial and industrial | Criticized | Criticized performing
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	407	992
2022	763	560
2021	330	156
2020	52	160
2019	260	167
Prior	330	76
Total Term Loans	2,142	2,111
Revolving Loans	852	964
Revolving Loans Converted to Term	0	0
Total	2,994	3,075
Commercial Portfolio | Commercial and industrial | Criticized | Criticized nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	8	196
2022	22	21
2021	43	5
2020	24	87
2019	145	40
Prior	97	5
Total Term Loans	339	354
Revolving Loans	56	76
Revolving Loans Converted to Term	0	0
Total	$ 395	$ 430