Loans - Summary of Concentration of Secured and Unsecured Loans (Detail) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 119,989
|
$ 110,345
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans receivable at fair value |
$ 13,625
|
$ 14,386
|
| Corporate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 48,659
|
$ 46,307
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans receivable at fair value |
$ 2,751
|
$ 3,224
|
| Wealth management [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 33,023
|
$ 27,940
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans receivable at fair value |
$ 7,872
|
$ 7,824
|
| Commercial real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 20,290
|
$ 17,743
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans receivable at fair value |
$ 1,961
|
$ 1,876
|
| Residential real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 5,750
|
$ 6,958
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans receivable at fair value |
$ 494
|
$ 792
|
| Installment [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 3,823
|
$ 4,747
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Credit Card Receivable [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 4,270
|
$ 1,858
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Other [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 4,174
|
$ 4,792
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans receivable at fair value |
$ 547
|
$ 670
|
| Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 119,989
|
$ 110,345
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Internally rated loans [Member] | Corporate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 48,659
|
$ 46,307
|
| Internally rated loans [Member] | Wealth management [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
33,023
|
27,940
|
| Internally rated loans [Member] | Commercial real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
20,290
|
17,743
|
| Internally rated loans [Member] | Residential real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
5,750
|
6,958
|
| Internally rated loans [Member] | Installment [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
3,823
|
4,747
|
| Internally rated loans [Member] | Credit Card Receivable [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
4,270
|
1,858
|
| Internally rated loans [Member] | Other [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 4,174
|
$ 4,792
|
| Secured Loans [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Concentration Risk,Percentage |
82.00%
|
83.00%
|
| Unsecured Loans [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Concentration Risk,Percentage |
18.00%
|
17.00%
|
| Amortized cost [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 103,565
|
$ 90,636
|
| Loans receivable at fair value |
101,305
|
89,186
|
| Amortized cost [Member] | Corporate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
44,778
|
41,129
|
| Amortized cost [Member] | Wealth management [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
25,151
|
20,116
|
| Amortized cost [Member] | Commercial real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
17,096
|
13,258
|
| Amortized cost [Member] | Residential real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
5,236
|
6,132
|
| Amortized cost [Member] | Credit Card Receivable [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
4,270
|
1,858
|
| Amortized cost [Member] | Other [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
3,211
|
3,396
|
| Fair Value [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
13,625
|
14,386
|
| Fair Value [Member] | Corporate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
2,751
|
3,224
|
| Fair Value [Member] | Wealth management [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
7,872
|
7,824
|
| Fair Value [Member] | Commercial real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
1,961
|
1,876
|
| Fair Value [Member] | Residential real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
494
|
792
|
| Fair Value [Member] | Other [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
547
|
670
|
| Fair Value [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
13,625
|
14,386
|
| Held for sale [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
2,799
|
5,323
|
| Loans receivable at fair value |
2,812
|
5,409
|
| Held for sale [Member] | Corporate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
1,130
|
1,954
|
| Held for sale [Member] | Commercial real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
1,233
|
2,609
|
| Held for sale [Member] | Residential real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
20
|
34
|
| Held for sale [Member] | Other [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
416
|
726
|
| Held for sale [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
2,799
|
5,323
|
| Loans Receivable [Member] | Amortized cost [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
103,565
|
90,636
|
| Loans Receivable [Member] | Investment-Grade [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 35,840
|
$ 33,433
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans Receivable [Member] | Investment-Grade [Member] | Internally rated loans [Member] | Corporate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 9,478
|
$ 10,507
|
| Loans Receivable [Member] | Investment-Grade [Member] | Internally rated loans [Member] | Wealth management [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
22,098
|
20,001
|
| Loans Receivable [Member] | Investment-Grade [Member] | Internally rated loans [Member] | Commercial real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
1,792
|
306
|
| Loans Receivable [Member] | Investment-Grade [Member] | Internally rated loans [Member] | Residential real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
636
|
244
|
| Loans Receivable [Member] | Investment-Grade [Member] | Internally rated loans [Member] | Other [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 1,836
|
$ 2,375
|
| Loans Receivable [Member] | Investment-Grade [Member] | Secured Loans [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Concentration Risk,Percentage |
83.00%
|
83.00%
|
| Loans Receivable [Member] | Investment-Grade [Member] | Unsecured Loans [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Concentration Risk,Percentage |
17.00%
|
17.00%
|
| Loans Receivable [Member] | Investment-Grade [Member] | Amortized cost [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 33,532
|
$ 30,266
|
| Loans Receivable [Member] | Investment-Grade [Member] | Fair Value [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
2,084
|
2,844
|
| Loans Receivable [Member] | Investment-Grade [Member] | Held for sale [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
224
|
323
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 66,327
|
$ 60,764
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Internally rated loans [Member] | Corporate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 38,704
|
$ 35,509
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Internally rated loans [Member] | Wealth management [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
5,331
|
3,576
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Internally rated loans [Member] | Commercial real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
17,480
|
15,997
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Internally rated loans [Member] | Residential real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
3,852
|
4,600
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Internally rated loans [Member] | Other [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 960
|
$ 1,082
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Secured Loans [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Concentration Risk,Percentage |
90.00%
|
91.00%
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Unsecured Loans [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Concentration Risk,Percentage |
10.00%
|
9.00%
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Amortized cost [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 58,250
|
$ 51,222
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Fair Value [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
5,925
|
5,174
|
| Loans Receivable [Member] | Non-Investment-Grade [Member] | Held for sale [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
2,152
|
4,368
|
| Loans Receivable [Member] | Unrated/Other [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 17,822
|
$ 16,148
|
| Concentration Risk,Percentage |
100.00%
|
100.00%
|
| Loans Receivable [Member] | Unrated/Other [Member] | Internally rated loans [Member] | Corporate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 477
|
$ 291
|
| Loans Receivable [Member] | Unrated/Other [Member] | Internally rated loans [Member] | Wealth management [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
5,594
|
4,363
|
| Loans Receivable [Member] | Unrated/Other [Member] | Internally rated loans [Member] | Commercial real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
1,018
|
1,440
|
| Loans Receivable [Member] | Unrated/Other [Member] | Internally rated loans [Member] | Residential real estate [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
1,262
|
2,114
|
| Loans Receivable [Member] | Unrated/Other [Member] | Internally rated loans [Member] | Installment [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
3,823
|
4,747
|
| Loans Receivable [Member] | Unrated/Other [Member] | Internally rated loans [Member] | Credit Card Receivable [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
4,270
|
1,858
|
| Loans Receivable [Member] | Unrated/Other [Member] | Internally rated loans [Member] | Other [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 1,378
|
$ 1,335
|
| Loans Receivable [Member] | Unrated/Other [Member] | Secured Loans [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Concentration Risk,Percentage |
46.00%
|
54.00%
|
| Loans Receivable [Member] | Unrated/Other [Member] | Unsecured Loans [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Concentration Risk,Percentage |
54.00%
|
46.00%
|
| Loans Receivable [Member] | Unrated/Other [Member] | Amortized cost [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans and Leases Receivable, Gross |
$ 11,783
|
$ 9,148
|
| Loans Receivable [Member] | Unrated/Other [Member] | Fair Value [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans receivable at fair value |
5,616
|
6,368
|
| Loans Receivable [Member] | Unrated/Other [Member] | Held for sale [Member] | Internally rated loans [Member] |
|
|
| Financing Receivable, Recorded Investment [Line Items] |
|
|
| Loans Receivable Held-for-sale, Amount |
$ 423
|
$ 632
|