Loans and Allowance for Credit Losses - Investments by Credit Quality (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 34,114	$ 32,145
Financing receivable, held-for-sale	9	5
Current fiscal year	3,950	5,839
Fiscal year before current fiscal year	3,071	5,104
Two years before current fiscal year	4,969	512
Three years before current fiscal year	459	1,636
Four years before current fiscal year	1,503	1,092
Prior	1,500	668
Revolving Loans	18,662	17,294
Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	29,404	27,176
Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,186	4,491
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	423	379
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	25	99
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	76
Commercial and Financial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	31,131	29,160
Commercial and Financial | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	27,116	24,667
Commercial and Financial | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,636	4,103
Commercial and Financial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	324	291
Commercial and Financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	25	99
Commercial and Financial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	30
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,983	2,985
Commercial Real Estate | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,288	2,509
Commercial Real Estate | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	550	388
Commercial Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	99	88
Commercial Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial Real Estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	46
Domestic | Commercial and Financial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	18,231	18,258
Current fiscal year	1,758	2,100
Fiscal year before current fiscal year	400	1,164
Two years before current fiscal year	1,081	245
Three years before current fiscal year	203	908
Four years before current fiscal year	767	286
Prior	253	167
Revolving Loans	13,769	13,388
Domestic | Commercial and Financial | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	15,567	14,986
Current fiscal year	1,408	1,577
Fiscal year before current fiscal year	120	185
Two years before current fiscal year	171	72
Three years before current fiscal year	61	300
Four years before current fiscal year	285	0
Prior	6	9
Revolving Loans	13,516	12,843
Domestic | Commercial and Financial | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,362	2,943
Current fiscal year	319	523
Fiscal year before current fiscal year	280	859
Two years before current fiscal year	719	168
Three years before current fiscal year	137	461
Four years before current fiscal year	407	236
Prior	247	151
Revolving Loans	253	545
Domestic | Commercial and Financial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	247	244
Current fiscal year	5	0
Fiscal year before current fiscal year	0	120
Two years before current fiscal year	167	0
Three years before current fiscal year	0	105
Four years before current fiscal year	75	19
Prior	0	0
Revolving Loans	0	0
Domestic | Commercial and Financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	25	85
Current fiscal year	20	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	5
Three years before current fiscal year	5	42
Four years before current fiscal year	0	31
Prior	0	7
Revolving Loans	0	0
Domestic | Commercial and Financial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	30
Current fiscal year	6
Fiscal year before current fiscal year	0
Two years before current fiscal year	24
Three years before current fiscal year	0
Four years before current fiscal year	0
Prior	0
Revolving Loans	0
Domestic | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,983	2,985
Current fiscal year	83	519
Fiscal year before current fiscal year	520	612
Two years before current fiscal year	528	149
Three years before current fiscal year	149	542
Four years before current fiscal year	541	662
Prior	1,162	501
Revolving Loans	0	0
Domestic | Commercial Real Estate | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,288	2,508
Current fiscal year	83	519
Fiscal year before current fiscal year	500	612
Two years before current fiscal year	528	100
Three years before current fiscal year	100	330
Four years before current fiscal year	330	511
Prior	747	436
Revolving Loans	0	0
Domestic | Commercial Real Estate | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	550	388
Current fiscal year	0	0
Fiscal year before current fiscal year	20	0
Two years before current fiscal year	0	49
Three years before current fiscal year	49	163
Four years before current fiscal year	189	111
Prior	292	65
Revolving Loans	0	0
Domestic | Commercial Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	99	89
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	49
Four years before current fiscal year	22	40
Prior	77	0
Revolving Loans	0	0
Domestic | Commercial Real Estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	46
Current fiscal year	0
Fiscal year before current fiscal year	0
Two years before current fiscal year	0
Three years before current fiscal year	0
Four years before current fiscal year	0
Prior	46
Revolving Loans	0
Domestic | Fund Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Overdrafts	3,080	$ 2,800
Domestic | Fund Finance | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Overdrafts	2,780
Domestic | Fund Finance | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Overdrafts	$ 300