Loans and Allowance for Credit Losses - Investments by Credit Quality (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 33,904	$ 32,145
Financing receivable, held-for-sale	12	5
2023	4,071	5,839
2022	3,039	5,104
2021	4,944	512
2020	459	1,636
2019	1,642	1,092
Prior	1,679	668
Revolving Loans	18,070	17,294
Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	29,229	27,176
Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4,058	4,491
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	443	379
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	129	99
Commercial and Financial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	31,003	29,160
Commercial and Financial | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	27,003	24,667
Commercial and Financial | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,516	4,103
Commercial and Financial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	355	291
Commercial and Financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	129	99
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,901	2,985
Commercial Real Estate | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,226	2,509
Commercial Real Estate | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	542	388
Commercial Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	88	88
Commercial Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Domestic | Commercial and Financial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	18,971	18,258
2023	2,463	2,100
2022	383	1,164
2021	1,085	245
2020	204	908
2019	907	286
Prior	372	167
Revolving Loans	13,557	13,388
Domestic | Commercial and Financial | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	16,148	14,986
2023	2,341	1,577
2022	161	185
2021	185	72
2020	66	300
2019	300	0
Prior	7	9
Revolving Loans	13,088	12,843
Domestic | Commercial and Financial | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,410	2,943
2023	117	523
2022	218	859
2021	710	168
2020	133	461
2019	436	236
Prior	327	151
Revolving Loans	469	545
Domestic | Commercial and Financial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	298	244
2023	5	0
2022	4	120
2021	160	0
2020	0	105
2019	129	19
Prior	0	0
Revolving Loans	0	0
Domestic | Commercial and Financial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	115	85
2023	0	0
2022	0	0
2021	30	5
2020	5	42
2019	42	31
Prior	38	7
Revolving Loans	0	0
Domestic | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,901	2,985
2023	0	519
2022	520	612
2021	528	149
2020	150	542
2019	541	662
Prior	1,162	501
Revolving Loans	0	0
Domestic | Commercial Real Estate | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,226	2,508
2023	0	519
2022	520	612
2021	528	100
2020	100	330
2019	330	511
Prior	748	436
Revolving Loans	0	0
Domestic | Commercial Real Estate | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Total	542	388
2023	0	0
2022	0	0
2021	0	49
2020	50	163
2019	163	111
Prior	329	65
Revolving Loans	0	0
Domestic | Commercial Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	88	89
2023	0	0
2022	0	0
2021	0	0
2020	0	49
2019	48	40
Prior	40	0
Revolving Loans	0	0
Domestic | Fund Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Overdrafts	3,810	$ 2,800
Domestic | Fund Finance | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
Overdrafts	3,660
Domestic | Fund Finance | Speculative
Financing Receivable, Credit Quality Indicator [Line Items]
Overdrafts	$ 150