Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 308,836	$ 312,331
Commercial Banking
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	7,527	33,735
2022	29,877	11,096
2021	9,643	4,458
2020	3,530	4,152
2019	3,297	2,781
Prior	7,792	6,814
Total Term Loans	61,666	63,036
Revolving Loans	31,727	31,594
Revolving Loans Converted to Term	150	46
Total	93,543	94,676
Commercial Banking | Commercial and multifamily real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	2,639	10,442
2022	9,572	4,484
2021	4,071	1,363
2020	962	2,096
2019	1,807	1,601
Prior	4,499	4,075
Total Term Loans	23,550	24,061
Revolving Loans	13,557	13,367
Revolving Loans Converted to Term	25	25
Total	37,132	37,453
Commercial Banking | Commercial and multifamily real estate | Noncriticized
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	2,106	9,527
2022	8,585	4,086
2021	3,630	1,161
2020	825	1,671
2019	1,363	1,280
Prior	3,064	2,898
Total Term Loans	19,573	20,623
Revolving Loans	13,445	13,254
Revolving Loans Converted to Term	25	25
Total	33,043	33,902
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized performing
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	533	814
2022	906	376
2021	415	202
2020	137	412
2019	367	302
Prior	1,283	1,061
Total Term Loans	3,641	3,167
Revolving Loans	112	113
Revolving Loans Converted to Term	0	0
Total	3,753	3,280
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	0	101
2022	81	22
2021	26	0
2020	0	13
2019	77	19
Prior	152	116
Total Term Loans	336	271
Revolving Loans	0	0
Revolving Loans Converted to Term	0	0
Total	336	271
Commercial Banking | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	4,888	23,293
2022	20,305	6,612
2021	5,572	3,095
2020	2,568	2,056
2019	1,490	1,180
Prior	3,293	2,739
Total Term Loans	38,116	38,975
Revolving Loans	18,170	18,227
Revolving Loans Converted to Term	125	21
Total	56,411	57,223
Commercial Banking | Commercial and industrial | Noncriticized
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	4,497	22,105
2022	19,171	6,031
2021	5,118	2,934
2020	2,456	1,809
2019	1,301	973
Prior	3,103	2,658
Total Term Loans	35,646	36,510
Revolving Loans	17,150	17,187
Revolving Loans Converted to Term	125	21
Total	52,921	53,718
Commercial Banking | Commercial and industrial | Criticized | Criticized performing
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	365	992
2022	939	560
2021	437	156
2020	91	160
2019	120	167
Prior	169	76
Total Term Loans	2,121	2,111
Revolving Loans	965	964
Revolving Loans Converted to Term	0	0
Total	3,086	3,075
Commercial Banking | Commercial and industrial | Criticized | Criticized nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	26	196
2022	195	21
2021	17	5
2020	21	87
2019	69	40
Prior	21	5
Total Term Loans	349	354
Revolving Loans	55	76
Revolving Loans Converted to Term	0	0
Total	$ 404	$ 430