Derivative Instruments - Notional Amount of Derivative Contracts (Details) - USD ($) $ in Billions	Mar. 31, 2024	Dec. 31, 2023
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	$ 54,571	$ 49,813
Interest rate contracts
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	35,238	32,673
Swaps
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	25,005	23,251
Futures and forwards
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	3,701	2,690
Options | Written options
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	3,282	3,370
Options | Purchased options
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	3,250	3,362
Credit derivatives
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	1,216	1,045
Foreign exchange contracts
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	14,866	13,306
Cross-currency swaps
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	4,681	4,721
Spot, futures and forwards
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	8,466	6,957
Options | Written options
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	871	830
Options | Purchased options
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	848	798
Equity contracts
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	2,689	2,272
Swaps
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	769	639
Futures and forwards
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	192	157
Options | Written options
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	911	778
Options | Purchased options
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	817	698
Commodity contracts
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	562	517
Swaps
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	120	115
Spot, futures and forwards
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	175	157
Options | Written options
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	142	130
Options | Purchased options
Notional amount of derivative contracts outstanding [Abstract]
Derivative notional amounts	$ 125	$ 115