Derivative Instruments - Summary of Customer-Related Derivative Positions of Company (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional Value	$ 1,800,000
Customer-Related Positions [Member]
Derivative [Line Items]
Notional Value	1,703,652	$ 1,014,834
Fair Value, Assets	7,084	7,476
Fair Value, Liabilities	10,351	10,277
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Receive Fixed/Pay Floating Swaps [Member]
Derivative [Line Items]
Notional Value	626,975	301,690
Fair Value, Assets	287	309
Fair Value, Liabilities	6,063	5,689
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Pay Fixed/Receive Floating Swaps [Member]
Derivative [Line Items]
Notional Value	618,184	316,133
Fair Value, Assets	2,358	2,323
Fair Value, Liabilities	217	206
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Other Derivatives [Member]
Derivative [Line Items]
Notional Value	83,116	40,261
Fair Value, Assets	21	3
Fair Value, Liabilities	55	16
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Options [Member] | Purchased [Member]
Derivative [Line Items]
Notional Value	116,596	103,489
Fair Value, Assets	1,837	1,794
Fair Value, Liabilities	1	5
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Options [Member] | Written [Member]
Derivative [Line Items]
Notional Value	113,163	99,923
Fair Value, Assets	1	6
Fair Value, Liabilities	1,831	1,779
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Futures [Member] | Purchased [Member]
Derivative [Line Items]
Notional Value		3,623
Fair Value, Liabilities		4
Customer-Related Positions [Member] | Interest Rate Contracts [Member] | Futures [Member] | Written [Member]
Derivative [Line Items]
Notional Value		2,376
Fair Value, Assets		8
Customer-Related Positions [Member] | Foreign Exchange Rate Contracts [Member] | Forwards, Spots and Swaps [Member]
Derivative [Line Items]
Notional Value	128,711	134,666
Fair Value, Assets	2,508	3,010
Fair Value, Liabilities	2,107	2,548
Customer-Related Positions [Member] | Foreign Exchange Option [Member] | Purchased [Member]
Derivative [Line Items]
Notional Value	1,027	954
Fair Value, Assets	27	22
Customer-Related Positions [Member] | Foreign Exchange Option [Member] | Written [Member]
Derivative [Line Items]
Notional Value	1,027	954
Fair Value, Liabilities	27	22
Customer-Related Positions [Member] | Commodity Contract [Member] | Swap [Member]
Derivative [Line Items]
Notional Value	378
Fair Value, Assets	8
Fair Value, Liabilities	7
Customer-Related Positions [Member] | Commodity Option [Member] | Purchased [Member]
Derivative [Line Items]
Notional Value	894
Fair Value, Assets	36
Fair Value, Liabilities	35
Customer-Related Positions [Member] | Credit Contracts [Member]
Derivative [Line Items]
Notional Value	13,581	10,765
Fair Value, Assets	1	1
Fair Value, Liabilities	$ 8	$ 8