Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans held for investment	$ 318,186	$ 320,472
Commercial Banking:
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	3,953	10,556
Term Loans by Vintage Year, Year 2	9,358	18,879
Term Loans by Vintage Year, Year 3	16,848	11,282
Term Loans by Vintage Year, Year 4	9,842	5,124
Term Loans by Vintage Year, Year 5	4,503	5,444
Prior	14,877	10,271
Total Term Loans	59,381	61,556
Revolving Loans	29,024	28,740
Revolving Loans Converted to Term	223	192
Total loans held for investment	88,628	90,488
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	1,218	3,281
Term Loans by Vintage Year, Year 2	2,581	6,185
Term Loans by Vintage Year, Year 3	5,401	3,603
Term Loans by Vintage Year, Year 4	3,064	1,303
Term Loans by Vintage Year, Year 5	1,131	2,614
Prior	6,586	4,737
Total Term Loans	19,981	21,723
Revolving Loans	12,728	12,698
Revolving Loans Converted to Term	123	25
Total loans held for investment	32,832	34,446
Commercial Banking: | Commercial and multifamily real estate | Noncriticized
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	1,134	3,068
Term Loans by Vintage Year, Year 2	2,511	4,665
Term Loans by Vintage Year, Year 3	3,821	2,773
Term Loans by Vintage Year, Year 4	2,245	1,019
Term Loans by Vintage Year, Year 5	914	2,104
Prior	4,974	3,670
Total Term Loans	15,599	17,299
Revolving Loans	12,499	12,565
Revolving Loans Converted to Term	25	25
Total loans held for investment	28,123	29,889
Commercial Banking: | Commercial and multifamily real estate | Criticized | Criticized performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	72	148
Term Loans by Vintage Year, Year 2	60	1,494
Term Loans by Vintage Year, Year 3	1,555	706
Term Loans by Vintage Year, Year 4	713	284
Term Loans by Vintage Year, Year 5	217	463
Prior	1,351	904
Total Term Loans	3,968	3,999
Revolving Loans	221	133
Revolving Loans Converted to Term	98	0
Total loans held for investment	4,287	4,132
Commercial Banking: | Commercial and multifamily real estate | Criticized | Criticized nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	12	65
Term Loans by Vintage Year, Year 2	10	26
Term Loans by Vintage Year, Year 3	25	124
Term Loans by Vintage Year, Year 4	106	0
Term Loans by Vintage Year, Year 5	0	47
Prior	261	163
Total Term Loans	414	425
Revolving Loans	8	0
Revolving Loans Converted to Term	0	0
Total loans held for investment	422	425
Commercial Banking: | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	2,735	7,275
Term Loans by Vintage Year, Year 2	6,777	12,694
Term Loans by Vintage Year, Year 3	11,447	7,679
Term Loans by Vintage Year, Year 4	6,778	3,821
Term Loans by Vintage Year, Year 5	3,372	2,830
Prior	8,291	5,534
Total Term Loans	39,400	39,833
Revolving Loans	16,296	16,042
Revolving Loans Converted to Term	100	167
Total loans held for investment	55,796	56,042
Commercial Banking: | Commercial and industrial | Noncriticized
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	2,674	6,909
Term Loans by Vintage Year, Year 2	6,610	11,935
Term Loans by Vintage Year, Year 3	10,576	6,994
Term Loans by Vintage Year, Year 4	6,008	3,566
Term Loans by Vintage Year, Year 5	3,018	2,359
Prior	7,547	5,117
Total Term Loans	36,433	36,880
Revolving Loans	15,082	14,822
Revolving Loans Converted to Term	57	167
Total loans held for investment	51,572	51,869
Commercial Banking: | Commercial and industrial | Criticized | Criticized performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	30	353
Term Loans by Vintage Year, Year 2	92	706
Term Loans by Vintage Year, Year 3	750	655
Term Loans by Vintage Year, Year 4	747	237
Term Loans by Vintage Year, Year 5	173	348
Prior	576	349
Total Term Loans	2,368	2,648
Revolving Loans	941	1,189
Revolving Loans Converted to Term	43	0
Total loans held for investment	3,352	3,837
Commercial Banking: | Commercial and industrial | Criticized | Criticized nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Term Loans by Vintage Year, Year 1	31	13
Term Loans by Vintage Year, Year 2	75	53
Term Loans by Vintage Year, Year 3	121	30
Term Loans by Vintage Year, Year 4	23	18
Term Loans by Vintage Year, Year 5	181	123
Prior	168	68
Total Term Loans	599	305
Revolving Loans	273	31
Revolving Loans Converted to Term	0	0
Total loans held for investment	$ 872	$ 336