Loans and Allowance for Credit Losses - Summary of Loans by Portfolio Class and Company's Internal Credit Quality Rating (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 332,369	$ 312,028
Total outstanding commitments	709,433	671,419
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	327,947	306,471
Total outstanding commitments	702,561	662,363
Special Mention Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,080	1,684
Total outstanding commitments	2,021	3,372
Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,342	3,873
Total outstanding commitments	4,851	5,684
Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,422	5,557
Total outstanding commitments	6,872	9,056
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	32,866
Originated in 2021	40,940	51,829
Originated in 2020	10,112	14,528
Originated in 2019	6,691	10,364
Originated in 2018	3,336	5,161
Originated prior to 2018	3,958	5,034
Revolving	28,080	25,107
Total loans	125,983	112,023
Commercial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	32,672
Originated in 2021	40,532	51,155
Originated in 2020	9,809	14,091
Originated in 2019	6,624	10,159
Originated in 2018	3,313	5,122
Originated prior to 2018	3,902	4,923
Revolving	27,628	24,722
Total loans	124,480	110,172
Commercial [Member] \| Special Mention Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	52
Originated in 2021	298	387
Originated in 2020	11	304
Originated in 2019	6	151
Originated in 2018	3	3
Originated prior to 2018	18	30
Revolving	277	268
Total loans	665	1,143
Commercial [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	142
Originated in 2021	110	287
Originated in 2020	292	133
Originated in 2019	61	54
Originated in 2018	20	36
Originated prior to 2018	38	81
Revolving	175	117
Total loans	838	708
Commercial [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	194
Originated in 2021	408	674
Originated in 2020	303	437
Originated in 2019	67	205
Originated in 2018	23	39
Originated prior to 2018	56	111
Revolving	452	385
Total loans	1,503	1,851
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	7,286
Originated in 2021	12,507	14,360
Originated in 2020	6,767	7,920
Originated in 2019	5,489	7,229
Originated in 2018	2,588	3,254
Originated prior to 2018	3,600	4,752
Revolving	1,516	1,538
Total loans	39,753	39,053
Commercial Real Estate [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	6,689
Originated in 2021	11,992	13,364
Originated in 2020	6,570	7,459
Originated in 2019	5,009	6,368
Originated in 2018	2,348	2,996
Originated prior to 2018	3,438	4,473
Revolving	1,511	1,494
Total loans	37,557	36,154
Commercial Real Estate [Member] \| Special Mention Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	148
Originated in 2021	63	6
Originated in 2020	16	198
Originated in 2019	140	251
Originated in 2018	29	29
Originated prior to 2018	19	55
Revolving		1
Total loans	415	540
Commercial Real Estate [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	449
Originated in 2021	452	990
Originated in 2020	181	263
Originated in 2019	340	610
Originated in 2018	211	229
Originated prior to 2018	143	224
Revolving	5	43
Total loans	1,781	2,359
Commercial Real Estate [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	597
Originated in 2021	515	996
Originated in 2020	197	461
Originated in 2019	480	861
Originated in 2018	240	258
Originated prior to 2018	162	279
Revolving	5	44
Total loans	2,196	2,899
Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	12,396
Originated in 2021	29,449	29,885
Originated in 2020	14,394	15,957
Originated in 2019	5,858	6,974
Originated in 2018	2,401	2,919
Originated prior to 2018	17,616	20,757
Revolving		1
Total loans	82,114	76,493
Residential Mortgages [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	12,396
Originated in 2021	29,446	29,882
Originated in 2020	14,384	15,948
Originated in 2019	5,834	6,938
Originated in 2018	2,383	2,889
Originated prior to 2018	17,328	20,415
Revolving		1
Total loans	81,771	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	3	3
Originated in 2020	10	8
Originated in 2019	24	36
Originated in 2018	18	30
Originated prior to 2018	288	342
Total loans	343	419
Residential Mortgages [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2021	3	3
Originated in 2020	10	9
Originated in 2019	24	36
Originated in 2018	18	30
Originated prior to 2018	288	342
Total loans	343	420
Other Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	7,651
Originated in 2021	18,833	22,461
Originated in 2020	9,991	12,080
Originated in 2019	5,489	7,240
Originated in 2018	2,214	3,299
Originated prior to 2018	2,644	3,723
Revolving	13,494	12,644
Revolving converted to term	506	512
Total loans	60,822	61,959
Other Retail [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	7,650
Originated in 2021	18,825	22,455
Originated in 2020	9,981	12,071
Originated in 2019	5,476	7,223
Originated in 2018	2,204	3,285
Originated prior to 2018	2,626	3,699
Revolving	13,381	12,532
Revolving converted to term	464	472
Total loans	60,607	61,737
Other Retail [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	1
Originated in 2021	8	6
Originated in 2020	10	9
Originated in 2019	13	17
Originated in 2018	10	14
Originated prior to 2018	18	24
Revolving	113	112
Revolving converted to term	42	40
Total loans	215	222
Other Retail [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Originated in 2022	1
Originated in 2021	8	6
Originated in 2020	10	9
Originated in 2019	13	17
Originated in 2018	10	14
Originated prior to 2018	18	24
Revolving	113	112
Revolving converted to term	42	40
Total loans	215	222
Credit Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,697	22,500
Credit Card [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,532	22,335
Credit Card [Member] \| Classified Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	165	165
Credit Card [Member] \| Total Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 165	$ 165

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