Fair Value Measurement - Level 3 Analysis (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	$ 0	$ 0	$ 0	$ 0
Transfers from level 3 into level 2, assets	0	0	0	0
Realized/unrealized gains (losses), assets	119	275	397	264
Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	5	8	5	8
Transfers from level 3 into level 2, assets	0	2	0	2
Realized/unrealized gains (losses), assets	37	16	66	21
Non-trading loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets	366	760	669	917
Transfers from level 3 into level 2, assets	59	68	223	177
Realized/unrealized gains (losses), assets	72	(3)	109	23
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value	1,531,037		1,531,037		$ 1,130,863
Recurring | Derivative payables | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, liabilities		1,200		1,600
Recurring | Derivative payables | Equity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, liabilities			798
Transfers from level 3 into level 2, liabilities			987	827
Recurring | MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in level 3 assets	242		325
Recurring | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in level 3 assets	391		444
Recurring | Derivative receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in level 3 assets			1,300
Recurring | Derivative receivables | Equity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets			759	901
Transfers from level 3 into level 2, assets				1,300
Recurring | Non-trading loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 into level 3, assets		760		917
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value	25,589		25,589		$ 23,656
Increase in level 3 assets	860		1,900
Realized/unrealized gains (losses), assets	682	(752)	(117)	139
Realized/unrealized losses, liabilities	$ 1	$ 328	$ 517	$ 1,800