Loans and Allowance for Credit Losses - Summary of Loans by Portfolio Class and Company's Internal Credit Quality Rating (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 342,708	$ 312,028
Total outstanding commitments	719,970	671,419
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	338,811	306,471
Total outstanding commitments	713,989	662,363
Special Mention Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,191	1,684
Total outstanding commitments	1,947	3,372
Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,706	3,873
Total outstanding commitments	4,034	5,684
Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,897	5,557
Total outstanding commitments	5,981	9,056
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	51,989
Originated in 2021	32,599	51,829
Originated in 2020	7,750	14,528
Originated in 2019	5,191	10,364
Originated in 2018	2,594	5,161
Originated prior to 2018	3,617	5,034
Revolving	27,947	25,107
Total loans	131,687	112,023
Commercial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	51,614
Originated in 2021	32,393	51,155
Originated in 2020	7,634	14,091
Originated in 2019	5,057	10,159
Originated in 2018	2,569	5,122
Originated prior to 2018	3,571	4,923
Revolving	27,263	24,722
Total loans	130,101	110,172
Commercial [Member] \| Special Mention Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	166
Originated in 2021	179	387
Originated in 2020	35	304
Originated in 2019	67	151
Originated in 2018	5	3
Originated prior to 2018	4	30
Revolving	397	268
Total loans	853	1,143
Commercial [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	209
Originated in 2021	27	287
Originated in 2020	81	133
Originated in 2019	67	54
Originated in 2018	20	36
Originated prior to 2018	42	81
Revolving	287	117
Total loans	733	708
Commercial [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	375
Originated in 2021	206	674
Originated in 2020	116	437
Originated in 2019	134	205
Originated in 2018	25	39
Originated prior to 2018	46	111
Revolving	684	385
Total loans	1,586	1,851
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	10,506
Originated in 2021	12,046	14,360
Originated in 2020	6,000	7,920
Originated in 2019	4,761	7,229
Originated in 2018	2,232	3,254
Originated prior to 2018	3,227	4,752
Revolving	1,557	1,538
Total loans	40,329	39,053
Commercial Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	9,925
Originated in 2021	11,746	13,364
Originated in 2020	5,818	7,459
Originated in 2019	4,469	6,368
Originated in 2018	2,069	2,996
Originated prior to 2018	3,122	4,473
Revolving	1,553	1,494
Total loans	38,702	36,154
Commercial Real Estate [Member] \| Special Mention Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	70
Originated in 2021	44	6
Originated in 2020	63	198
Originated in 2019	110	251
Originated in 2018	28	29
Originated prior to 2018	23	55
Revolving		1
Total loans	338	540
Commercial Real Estate [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	511
Originated in 2021	256	990
Originated in 2020	119	263
Originated in 2019	182	610
Originated in 2018	135	229
Originated prior to 2018	82	224
Revolving	4	43
Total loans	1,289	2,359
Commercial Real Estate [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	581
Originated in 2021	300	996
Originated in 2020	182	461
Originated in 2019	292	861
Originated in 2018	163	258
Originated prior to 2018	105	279
Revolving	4	44
Total loans	1,627	2,899
Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	17,964
Originated in 2021	29,226	29,885
Originated in 2020	14,235	15,957
Originated in 2019	5,667	6,974
Originated in 2018	2,318	2,919
Originated prior to 2018	16,837	20,757
Revolving	27	1
Total loans	86,274	76,493
Residential Mortgages [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	17,964
Originated in 2021	29,224	29,882
Originated in 2020	14,230	15,948
Originated in 2019	5,649	6,938
Originated in 2018	2,300	2,889
Originated prior to 2018	16,580	20,415
Revolving	24	1
Total loans	85,971	76,073
Residential Mortgages [Member] \| Special Mention Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2020		1
Total loans		1
Residential Mortgages [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2021	2	3
Originated in 2020	5	8
Originated in 2019	18	36
Originated in 2018	18	30
Originated prior to 2018	257	342
Revolving	3
Total loans	303	419
Residential Mortgages [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2021	2	3
Originated in 2020	5	9
Originated in 2019	18	36
Originated in 2018	18	30
Originated prior to 2018	257	342
Revolving	3
Total loans	303	420
Other Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	10,214
Originated in 2021	17,412	22,461
Originated in 2020	9,143	12,080
Originated in 2019	4,676	7,240
Originated in 2018	1,896	3,299
Originated prior to 2018	2,332	3,723
Revolving	13,707	12,644
Revolving converted to term	500	512
Total loans	59,880	61,959
Other Retail [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	10,211
Originated in 2021	17,403	22,455
Originated in 2020	9,133	12,071
Originated in 2019	4,663	7,223
Originated in 2018	1,887	3,285
Originated prior to 2018	2,315	3,699
Revolving	13,610	12,532
Revolving converted to term	457	472
Total loans	59,679	61,737
Other Retail [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	3
Originated in 2021	9	6
Originated in 2020	10	9
Originated in 2019	13	17
Originated in 2018	9	14
Originated prior to 2018	17	24
Revolving	97	112
Revolving converted to term	43	40
Total loans	201	222
Other Retail [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	3
Originated in 2021	9	6
Originated in 2020	10	9
Originated in 2019	13	17
Originated in 2018	9	14
Originated prior to 2018	17	24
Revolving	97	112
Revolving converted to term	43	40
Total loans	201	222
Credit Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,538	22,500
Credit Card [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,358	22,335
Credit Card [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	180	165
Credit Card [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 180	$ 165

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