Fair Value Disclosures - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
| Assets measured at fair value, beginning balance |
$ 711
|
$ 302
|
$ 337
|
$ 300
|
| Realized and Unrealized Gains (Losses),Assets |
3
|
16
|
(3)
|
23
|
| Purchases, Assets |
74
|
113
|
471
|
127
|
| Sales and Maturities, Assets |
(337)
|
(18)
|
(354)
|
(38)
|
| Issuances and other Settlements, Assets |
0
|
0
|
0
|
0
|
| Transfers into Level 3, Assets |
6
|
5
|
9
|
10
|
| Transfers out of Level 3, Assets |
0
|
(2)
|
(3)
|
(6)
|
| Assets measured at fair value, ending balance |
457
|
416
|
457
|
416
|
| Total Net Unrealized Gains (Losses) Included in Earnings |
3
|
16
|
(3)
|
23
|
| Other Assets [Member] |
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
| Assets measured at fair value, beginning balance |
138
|
0
|
120
|
0
|
| Realized and Unrealized Gains (Losses),Assets |
0
|
0
|
(7)
|
0
|
| Purchases, Assets |
12
|
109
|
37
|
109
|
| Sales and Maturities, Assets |
0
|
0
|
0
|
0
|
| Issuances and other Settlements, Assets |
0
|
0
|
0
|
0
|
| Transfers into Level 3, Assets |
0
|
0
|
0
|
0
|
| Transfers out of Level 3, Assets |
0
|
0
|
0
|
0
|
| Assets measured at fair value, ending balance |
150
|
109
|
150
|
109
|
| Total Net Unrealized Gains (Losses) Included in Earnings |
0
|
0
|
(7)
|
0
|
| Other Liabilities [Member] |
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
| Liabilities measured at fair value, beginning balance |
258
|
257
|
279
|
280
|
| Realized and Unrealized Gains (Losses), Liabilities |
(3)
|
0
|
3
|
4
|
| Purchases, Liabilities |
0
|
0
|
0
|
0
|
| Sales and Maturities, Liabilities |
0
|
0
|
0
|
0
|
| Issuances and other Settlements, Liabilities |
37
|
(3)
|
22
|
(22)
|
| Transfers into Level 3, Liabilities |
0
|
0
|
|
0
|
| Transfers out of Level 3, Liabilities |
0
|
0
|
0
|
0
|
| Liabilities measured at fair value, ending balance |
298
|
254
|
298
|
254
|
| Total Net Unrealized Gains (Losses) Included in Earnings |
$ (3)
|
$ 0
|
$ 3
|
$ 4
|
| Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Nonoperating Income (Expense)
|
Nonoperating Income (Expense)
|
Nonoperating Income (Expense)
|
Nonoperating Income (Expense)
|
| Investments [Member] |
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
| Assets measured at fair value, beginning balance |
$ 573
|
$ 302
|
$ 217
|
$ 300
|
| Realized and Unrealized Gains (Losses),Assets |
3
|
16
|
4
|
23
|
| Purchases, Assets |
62
|
4
|
434
|
18
|
| Sales and Maturities, Assets |
(337)
|
(18)
|
(354)
|
(38)
|
| Issuances and other Settlements, Assets |
0
|
0
|
0
|
0
|
| Transfers into Level 3, Assets |
6
|
5
|
9
|
10
|
| Transfers out of Level 3, Assets |
0
|
(2)
|
(3)
|
(6)
|
| Assets measured at fair value, ending balance |
307
|
307
|
307
|
307
|
| Total Net Unrealized Gains (Losses) Included in Earnings |
3
|
16
|
4
|
23
|
| Debt securities [Member] |
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
| Assets measured at fair value, beginning balance |
48
|
55
|
42
|
52
|
| Realized and Unrealized Gains (Losses),Assets |
5
|
(1)
|
4
|
0
|
| Purchases, Assets |
29
|
4
|
36
|
6
|
| Sales and Maturities, Assets |
0
|
(17)
|
0
|
(17)
|
| Issuances and other Settlements, Assets |
0
|
0
|
0
|
0
|
| Transfers into Level 3, Assets |
0
|
0
|
0
|
0
|
| Transfers out of Level 3, Assets |
0
|
0
|
0
|
0
|
| Assets measured at fair value, ending balance |
82
|
41
|
82
|
41
|
| Total Net Unrealized Gains (Losses) Included in Earnings |
5
|
(1)
|
4
|
0
|
| Debt securities [Member] | Trading [Member] |
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
| Assets measured at fair value, beginning balance |
48
|
55
|
42
|
52
|
| Realized and Unrealized Gains (Losses),Assets |
5
|
(1)
|
4
|
0
|
| Purchases, Assets |
29
|
4
|
36
|
6
|
| Sales and Maturities, Assets |
0
|
(17)
|
0
|
(17)
|
| Issuances and other Settlements, Assets |
0
|
0
|
0
|
0
|
| Transfers into Level 3, Assets |
0
|
0
|
0
|
0
|
| Transfers out of Level 3, Assets |
0
|
0
|
0
|
0
|
| Assets measured at fair value, ending balance |
82
|
41
|
82
|
41
|
| Total Net Unrealized Gains (Losses) Included in Earnings |
$ 5
|
$ (1)
|
$ 4
|
$ 0
|
| Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Nonoperating Income (Expense)
|
Nonoperating Income (Expense)
|
Nonoperating Income (Expense)
|
Nonoperating Income (Expense)
|
| Consolidated Variable Interest Entities [Member] | Loans [Member] |
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
| Assets measured at fair value, beginning balance |
$ 525
|
$ 247
|
$ 175
|
$ 248
|
| Realized and Unrealized Gains (Losses),Assets |
(2)
|
17
|
0
|
23
|
| Purchases, Assets |
33
|
0
|
398
|
12
|
| Sales and Maturities, Assets |
(337)
|
(1)
|
(354)
|
(21)
|
| Issuances and other Settlements, Assets |
0
|
0
|
0
|
0
|
| Transfers into Level 3, Assets |
6
|
5
|
9
|
10
|
| Transfers out of Level 3, Assets |
0
|
(2)
|
(3)
|
(6)
|
| Assets measured at fair value, ending balance |
225
|
266
|
225
|
266
|
| Total Net Unrealized Gains (Losses) Included in Earnings |
$ (2)
|
$ 17
|
$ 0
|
$ 23
|