Derivative Financial Instruments - Fair Value of Derivatives and Balance Offsetting (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 18,505	$ 19,944
Derivative Liabilities	17,252	19,320
Gross amounts of receivable subject to enforceable master netting agreements	14,491	15,625
Gross amounts of payable subject to enforceable master netting agreements	14,491	15,625
Less: Gross amounts of cash collateral received subject to enforceable master netting agreements	2,565	2,653
Less: Gross amounts of cash collateral posted subject to enforceable master netting agreements	1,180	1,529
Derivative asset	1,449	1,666
Derivative liability	1,581	2,166
Less: Gross amounts of financial instrument collateral received not offset	101	234
Less: Gross amounts of financial instrument collateral posted not offset	48	32
Net amount of derivative asset	1,348	1,432
Net amount of derivative liability	$ 1,533	$ 2,134
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Interest, taxes and other liabilities (includes $61 million and $325 million designated under fair value option at June 30, 2023 and December 31, 2022, respectively)	Interest, taxes and other liabilities (includes $61 million and $325 million designated under fair value option at June 30, 2023 and December 31, 2022, respectively)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, net of allowance for credit losses of nil at both June 30, 2023 and December 31, 2022 (includes $61 million and $325 million designated under fair value option at June 30, 2023 and December 31, 2022, respectively)	Other assets, net of allowance for credit losses of nil at both June 30, 2023 and December 31, 2022 (includes $61 million and $325 million designated under fair value option at June 30, 2023 and December 31, 2022, respectively)
Trading Assets
Derivatives, Fair Value [Line Items]
Less: Gross amounts of cash collateral received subject to enforceable master netting agreements	$ 2,299	$ 2,653
Trading Liabilities
Derivatives, Fair Value [Line Items]
Less: Gross amounts of cash collateral posted subject to enforceable master netting agreements	1,180	1,180
Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	86	42
Designated as Hedging Instrument | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	8	86
Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,447	1,814
Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,099	1,371
Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	285	630
Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	798	270
Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,204	1,201
Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,104	1,255
Credit contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	9	7
Credit contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	68	61
Bilateral OTC | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,442	1,764
Bilateral OTC | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,088	1,364
Bilateral OTC | Interest rate contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Bilateral OTC | Interest rate contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	97	97
Bilateral OTC | Foreign exchange contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	14,743	15,744
Bilateral OTC | Foreign exchange contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	13,738	15,440
Bilateral OTC | Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	285	630
Bilateral OTC | Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	798	266
Bilateral OTC | Equity contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	660	398
Bilateral OTC | Equity contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	276	657
Bilateral OTC | Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	1,197	1,201
Bilateral OTC | Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,104	1,254
Bilateral OTC | Credit contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	68	103
Bilateral OTC | Credit contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	37	45
Bilateral OTC | Credit contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	9	7
Bilateral OTC | Credit contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	67	60
Bilateral OTC | Other Contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	3	5
Bilateral OTC | Other Contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	27	38
Bilateral OTC | Fair Value Hedging | Interest rate contracts | Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	16	42
Bilateral OTC | Fair Value Hedging | Interest rate contracts | Designated as Hedging Instrument | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	7	12
Bilateral OTC | Cash Flow Hedging | Interest rate contracts | Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Bilateral OTC | Cash Flow Hedging | Interest rate contracts | Designated as Hedging Instrument | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1	4
Bilateral OTC | Cash Flow Hedging | Foreign exchange contracts | Designated as Hedging Instrument | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	70	0
Bilateral OTC | Cash Flow Hedging | Foreign exchange contracts | Designated as Hedging Instrument | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	70
OTC Cleared | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	42
OTC Cleared | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	0
OTC Cleared | Credit contracts | Not Designated as Hedging Instrument, Other | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
OTC Cleared | Credit contracts | Not Designated as Hedging Instrument, Other | Interest taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1	1
Exchange Traded | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	5	8
Exchange Traded | Interest rate contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	11	7
Exchange Traded | Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	0
Exchange Traded | Equity contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	4
Exchange Traded | Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	7	0
Exchange Traded | Precious metals contracts | Not Designated as Hedging Instrument, Trading | Trading Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 0	$ 1