Derivatives, Offsetting of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022		Dec. 31, 2020
Derivative Assets
Derivative Assets, gross	$ 80,397	$ 73,207
Counterparty netting, assets	(54,730)	(49,115)
Cash collateral netting, assets	(9,770)	(7,049)
Total derivatives subject to enforceable master netting arrangements, net, assets	15,897	17,043
Derivatives not subject to enforceable master netting arrangements, assets	5,199	5,731
Derivative assets	21,096	22,774
Non-cash collateral not offset, assets	(3,935)	(3,517)
Total Derivatives, net, assets	17,161	19,257
Derivative Liabilities
Derivative Liabilities, gross	82,681	74,813
Counterparty netting, liabilities	(54,780)	(49,073)
Cash collateral netting, liabilities	(10,351)	(12,754)
Total derivatives subject to enforceable master netting arrangements, net, liabilities	17,550	12,986
Derivatives not subject to enforceable master netting arrangements , liabilities	5,913	7,081
Derivative liabilities	23,463	20,067	[1]	$ 16,482
Non-cash collateral not offset, Liabilities	(4,253)	(582)
Total Derivatives, net, liabilities	19,210	19,485
Derivatives (Textual) [Abstract]
Valuation adjustments for derivative assets	284	372
Valuation adjustments for derivative liabilities	334	331
Interest rate contracts [Member]
Derivative Assets
Derivative Assets, gross	42,158	37,911
Derivative Liabilities
Derivative Liabilities, gross	47,362	38,636
Interest rate contracts [Member] | OTC [Member]
Derivative Assets
Derivative Assets, gross	40,599	37,000
Derivative Liabilities
Derivative Liabilities, gross	45,392	37,598
Interest rate contracts [Member] | OTC cleared [Member]
Derivative Assets
Derivative Assets, gross	1,323	649
Derivative Liabilities
Derivative Liabilities, gross	1,641	845
Interest rate contracts [Member] | Exchange traded [Member]
Derivative Assets
Derivative Assets, gross	236	262
Derivative Liabilities
Derivative Liabilities, gross	329	193
Commodity contracts [Member]
Derivative Assets
Derivative Assets, gross	3,646	5,709
Derivative Liabilities
Derivative Liabilities, gross	1,982	3,144
Commodity contracts [Member] | OTC [Member]
Derivative Assets
Derivative Assets, gross	3,080	4,833
Derivative Liabilities
Derivative Liabilities, gross	1,384	2,010
Commodity contracts [Member] | Exchange traded [Member]
Derivative Assets
Derivative Assets, gross	566	876
Derivative Liabilities
Derivative Liabilities, gross	598	1,134
Equity contracts [Member]
Derivative Assets
Derivative Assets, gross	10,521	8,011
Derivative Liabilities
Derivative Liabilities, gross	9,461	6,884
Equity contracts [Member] | OTC [Member]
Derivative Assets
Derivative Assets, gross	6,794	4,269
Derivative Liabilities
Derivative Liabilities, gross	6,546	4,475
Equity contracts [Member] | Exchange traded [Member]
Derivative Assets
Derivative Assets, gross	3,727	3,742
Derivative Liabilities
Derivative Liabilities, gross	2,915	2,409
Foreign exchange contracts [Member]
Derivative Assets
Derivative Assets, gross	24,022	21,537
Derivative Liabilities
Derivative Liabilities, gross	23,858	26,127
Foreign exchange contracts [Member] | OTC [Member]
Derivative Assets
Derivative Assets, gross	24,022	21,537
Derivative Liabilities
Derivative Liabilities, gross	23,858	26,127
Credit contracts [Member]
Derivative Assets
Derivative Assets, gross	50	39
Derivative Liabilities
Derivative Liabilities, gross	18	22
Credit contracts [Member] | OTC [Member]
Derivative Assets
Derivative Assets, gross	50	39
Derivative Liabilities
Derivative Liabilities, gross	$ 18	$ 22

[1] In first quarter 2023, we adopted ASU 2018-12 – Financial Services – Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts. For additional information, see Note 1 (Summary of Significant Accounting Policies).