Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
|
|
|
|
| Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
7,601
|
7,421
|
$ 7,679
|
$ 7,431
|
| Included in Earnings |
128
|
27
|
152
|
38
|
| Included in other comprehensive income |
(1)
|
6
|
(4)
|
14
|
| Purchases |
103
|
104
|
398
|
358
|
| Sales |
(68)
|
(43)
|
(295)
|
(153)
|
| Issuances |
21
|
22
|
46
|
38
|
| Settlements |
(209)
|
(223)
|
(402)
|
(411)
|
| Transfers into Level 3 |
4
|
8
|
6
|
12
|
| Transfers out of Level 3 |
(10)
|
(14)
|
(21)
|
(19)
|
| Ending balance |
7,569
|
7,308
|
7,569
|
7,308
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
115
|
24
|
127
|
6
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
177
|
303
|
223
|
337
|
| Included in Earnings |
85
|
10
|
105
|
57
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
0
|
0
|
0
|
0
|
| Sales |
6
|
3
|
14
|
3
|
| Issuances |
28
|
5
|
245
|
10
|
| Settlements |
(73)
|
(83)
|
(364)
|
(169)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
223
|
238
|
223
|
238
|
| Unrealized gains/losses for the period on liabilities held on Consolidated Balance Sheet |
90
|
10
|
123
|
52
|
| Fair Value Additional Information [Abstract] |
|
|
|
|
| Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities |
43
|
17
|
47
|
(19)
|
| Net unrealized gains (losses) relating to Level 3 assets and liabilities |
25
|
14
|
4
|
(46)
|
| Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
10
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Fair Value, Recurring | Level 3 | Other borrowed funds |
|
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
5
|
13
|
7
|
10
|
| Included in Earnings |
0
|
0
|
0
|
0
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
2
|
5
|
5
|
10
|
| Settlements |
(3)
|
(7)
|
(8)
|
(9)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
4
|
11
|
4
|
11
|
| Unrealized gains/losses for the period on liabilities held on Consolidated Balance Sheet |
0
|
0
|
0
|
0
|
| Fair Value, Recurring | Level 3 | Other borrowed funds | FirstBank Holding Company |
|
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Fair Value, Recurring | Level 3 | Financial derivatives |
|
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
35
|
161
|
79
|
150
|
| Included in Earnings |
82
|
4
|
107
|
41
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
0
|
0
|
0
|
0
|
| Sales |
6
|
3
|
14
|
3
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
(26)
|
(59)
|
(103)
|
(85)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
97
|
109
|
97
|
109
|
| Unrealized gains/losses for the period on liabilities held on Consolidated Balance Sheet |
87
|
7
|
121
|
42
|
| Fair Value, Recurring | Level 3 | Financial derivatives | FirstBank Holding Company |
|
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Fair Value, Recurring | Level 3 | Other liabilities |
|
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
137
|
129
|
137
|
177
|
| Included in Earnings |
3
|
6
|
(2)
|
16
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
26
|
0
|
240
|
0
|
| Settlements |
(44)
|
(17)
|
(253)
|
(75)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
122
|
118
|
122
|
118
|
| Unrealized gains/losses for the period on liabilities held on Consolidated Balance Sheet |
3
|
3
|
2
|
10
|
| Fair Value, Recurring | Level 3 | Other liabilities | FirstBank Holding Company |
|
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Loans held for sale | Fair Value, Recurring | Level 3 | Residential mortgage loans held for sale |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
74
|
104
|
108
|
68
|
| Included in Earnings |
0
|
1
|
0
|
1
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
2
|
32
|
2
|
73
|
| Sales |
0
|
(1)
|
(33)
|
(1)
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
(2)
|
(2)
|
(4)
|
(6)
|
| Transfers into Level 3 |
1
|
1
|
3
|
5
|
| Transfers out of Level 3 |
(5)
|
(5)
|
(6)
|
(10)
|
| Ending balance |
70
|
130
|
70
|
130
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
0
|
1
|
0
|
1
|
| Loans held for sale | Fair Value, Recurring | Level 3 | Residential mortgage loans held for sale | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Loans held for sale | Fair Value, Recurring | Level 3 | Commercial mortgage loans held for sale |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
|
4
|
|
4
|
| Included in Earnings |
|
0
|
|
0
|
| Included in other comprehensive income |
|
0
|
|
0
|
| Purchases |
|
0
|
|
0
|
| Sales |
|
0
|
|
0
|
| Issuances |
|
0
|
|
0
|
| Settlements |
|
(3)
|
|
(3)
|
| Transfers into Level 3 |
|
0
|
|
0
|
| Transfers out of Level 3 |
|
0
|
|
0
|
| Ending balance |
|
1
|
|
1
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
|
0
|
|
0
|
| Securities available-for-sale | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
751
|
841
|
769
|
853
|
| Included in Earnings |
3
|
4
|
7
|
4
|
| Included in other comprehensive income |
(3)
|
4
|
(6)
|
12
|
| Purchases |
3
|
3
|
3
|
3
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
(21)
|
(47)
|
(40)
|
(67)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
733
|
805
|
733
|
805
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
0
|
0
|
0
|
(3)
|
| Securities available-for-sale | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Residential mortgage- backed non-agency | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
533
|
596
|
548
|
603
|
| Included in Earnings |
2
|
3
|
5
|
5
|
| Included in other comprehensive income |
(3)
|
1
|
(6)
|
9
|
| Purchases |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
(15)
|
(19)
|
(30)
|
(36)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
517
|
581
|
517
|
581
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
0
|
0
|
0
|
0
|
| Residential mortgage- backed non-agency | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Commercial mortgage- backed non-agency | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
79
|
99
|
79
|
103
|
| Included in Earnings |
0
|
0
|
0
|
(3)
|
| Included in other comprehensive income |
0
|
2
|
0
|
1
|
| Purchases |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
0
|
(22)
|
0
|
(22)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
79
|
79
|
79
|
79
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
0
|
0
|
0
|
(3)
|
| Commercial mortgage- backed non-agency | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Asset-backed | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
84
|
92
|
87
|
93
|
| Included in Earnings |
1
|
0
|
1
|
1
|
| Included in other comprehensive income |
0
|
0
|
0
|
1
|
| Purchases |
0
|
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
(3)
|
(2)
|
(6)
|
(5)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
82
|
90
|
82
|
90
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
0
|
0
|
0
|
0
|
| Asset-backed | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Other | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
55
|
54
|
55
|
54
|
| Included in Earnings |
0
|
1
|
1
|
1
|
| Included in other comprehensive income |
0
|
1
|
0
|
1
|
| Purchases |
3
|
3
|
3
|
3
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
(3)
|
(4)
|
(4)
|
(4)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
55
|
55
|
55
|
55
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
0
|
0
|
0
|
0
|
| Other | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Loans | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
599
|
663
|
620
|
670
|
| Included in Earnings |
2
|
0
|
4
|
5
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
5
|
10
|
11
|
17
|
| Sales |
0
|
(1)
|
0
|
(1)
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
(19)
|
(19)
|
(38)
|
(38)
|
| Transfers into Level 3 |
3
|
7
|
3
|
7
|
| Transfers out of Level 3 |
(5)
|
(9)
|
(15)
|
(9)
|
| Ending balance |
585
|
651
|
585
|
651
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
1
|
0
|
4
|
5
|
| Loans | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Equity investments | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
2,341
|
2,223
|
2,503
|
2,111
|
| Included in Earnings |
32
|
9
|
6
|
55
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
50
|
40
|
108
|
216
|
| Sales |
(68)
|
(40)
|
(262)
|
(150)
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
2,355
|
2,232
|
2,355
|
2,232
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
23
|
5
|
(12)
|
29
|
| Equity investments | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Mortgage Servicing Rights | Fair Value, Recurring | Level 3 | Residential mortgage loans held for sale |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
2,786
|
2,523
|
2,638
|
2,626
|
| Included in Earnings |
22
|
(6)
|
9
|
(57)
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
26
|
0
|
240
|
1
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
10
|
7
|
20
|
14
|
| Settlements |
(82)
|
(67)
|
(155)
|
(127)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
2,762
|
2,457
|
2,762
|
2,457
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
22
|
(6)
|
9
|
(57)
|
| Mortgage Servicing Rights | Fair Value, Recurring | Level 3 | Residential mortgage loans held for sale | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
10
|
|
| Mortgage Servicing Rights | Fair Value, Recurring | Level 3 | Commercial mortgage loans held for sale |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
1,030
|
1,041
|
1,021
|
1,085
|
| Included in Earnings |
58
|
13
|
107
|
11
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
15
|
18
|
31
|
45
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
11
|
15
|
26
|
24
|
| Settlements |
(75)
|
(77)
|
(146)
|
(155)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
1,039
|
1,010
|
1,039
|
1,010
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
58
|
13
|
107
|
11
|
| Mortgage Servicing Rights | Fair Value, Recurring | Level 3 | Commercial mortgage loans held for sale | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Financial derivatives | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
5
|
10
|
6
|
4
|
| Included in Earnings |
11
|
6
|
19
|
19
|
| Included in other comprehensive income |
0
|
0
|
0
|
0
|
| Purchases |
1
|
1
|
1
|
1
|
| Sales |
0
|
0
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
(10)
|
(8)
|
(19)
|
(15)
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
7
|
9
|
7
|
9
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
11
|
11
|
19
|
20
|
| Financial derivatives | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
0
|
|
| Other assets | Fair Value, Recurring | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Beginning balance |
15
|
12
|
14
|
10
|
| Included in Earnings |
0
|
0
|
0
|
0
|
| Included in other comprehensive income |
2
|
2
|
2
|
2
|
| Purchases |
1
|
0
|
2
|
2
|
| Sales |
0
|
(1)
|
0
|
(1)
|
| Issuances |
0
|
0
|
0
|
0
|
| Settlements |
0
|
0
|
0
|
0
|
| Transfers into Level 3 |
0
|
0
|
0
|
0
|
| Transfers out of Level 3 |
0
|
0
|
0
|
0
|
| Ending balance |
18
|
13
|
18
|
13
|
| Unrealized gains/losses for the period on assets held on Consolidated Balance Sheet |
$ 0
|
$ 0
|
0
|
$ 0
|
| Other assets | Fair Value, Recurring | Level 3 | FirstBank Holding Company |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
|
| Purchases |
|
|
$ 0
|
|