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Comprehensive income (Tables)
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income
The following table displays the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income during the three-month periods ended September 30, 2025 and 2024:
(Dollars in millions)Investment
Securities 		Cash Flow HedgesDefined Benefit PlansOtherTotal
Amount
Before Tax 		Income
Tax 		Net
Balance — July 1, 2025$82 $85 $127 $(5)$289 $(74)$215 
Other comprehensive income (loss) before reclassifications:
Unrealized holding gains, net81 — — — 81 (21)60 
Unrealized losses, net— (16)— — (16)3 (13)
Other— — — (1)(1)— (1)
Total other comprehensive income (loss) before reclassifications81 (16)— (1)64 (18)46 
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:
Net yield adjustment from cash flow hedges currently in effect— 22 — — 22 (a)(4)18 
Amortization of prior service credit and
   actuarial gains
— — (2)— (2)(b)— (2)
Total other comprehensive income (loss)81 6 (2)(1)84 (22)62 
Balance — September 30, 2025$163 $91 $125 $(6)$373 $(96)$277 
Balance — July 1, 2024$(239)$(330)$(158)$(9)$(736)$185 $(551)
Other comprehensive income (loss) before reclassifications:
Unrealized holding gains, net308 — — — 308 (78)230 
Unrealized gains, net— 287 — — 287 (71)216 
Other— — — 5 5 (1)4 
Total other comprehensive income (loss) before reclassifications308 287 — 5 600 (150)450 
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:
Net yield adjustment from cash flow hedges currently in effect— 102 — — 102 (a)(27)75 
Amortization of prior service credit and
   actuarial gains
— — (2)— (2)(b)1 (1)
Total other comprehensive income (loss)308 389 (2)5 700 (176)524 
Balance — September 30, 2024$69 $59 $(160)$(4)$(36)$9 $(27)
(a)Included in Interest income in the Company's Consolidated Statement of Income.
(b)Included in Other costs of operations in the Company's Consolidated Statement of Income.
The following table displays the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income during the nine-month periods ended September 30, 2025 and 2024:
(Dollars in millions)Investment
Securities 		Cash Flow HedgesDefined Benefit PlansOtherTotal
Amount
Before Tax 		Income
Tax 		Net
Balance — January 1, 2025$(205)$(135)$131 $(10)$(219)$55 $(164)
Other comprehensive income (loss) before reclassifications:      
Unrealized holding gains, net368 — — — 368 (94)274 
Unrealized gains, net— 118 — — 118 (31)87 
Other— — — 4 4 (1)3 
Total other comprehensive income (loss) before reclassifications368 118 — 4 490 (126)364 
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:    
Net yield adjustment from cash flow hedges currently in effect— 108 — — 108 (a)(26)82 
Amortization of prior service credit and
   actuarial gains		— — (6)— (6)(b)1 (5)
Total other comprehensive income (loss)368 226 (6)4 592 (151)441 
Balance — September 30, 2025$163 $91 $125 $(6)$373 $(96)$277 
    
Balance — January 1, 2024$(251)$(203)$(155)$(7)$(616)$157 $(459)
Other comprehensive income (loss) before reclassifications:    
Unrealized holding gains, net307 — — — 307 (78)229 
Unrealized losses, net— (26)— — (26)7 (19)
Other— — — 3 3 (1)2 
Total other comprehensive income (loss) before reclassifications307 (26)— 3 284 (72)212 
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income:    
Net losses realized in net income13 — — — 13 (c)(4)9 
Net yield adjustment from cash flow hedges currently in effect— 288 — — 288 (a)(73)215 
Amortization of prior service credit and
   actuarial gains
— — (5)— (5)(b)1 (4)
Total other comprehensive income (loss)320 262 (5)3 580 (148)432 
Balance — September 30, 2024$69 $59 $(160)$(4)$(36)$9 $(27)
(a)Included in Interest income in the Company's Consolidated Statement of Income.
(b)Included in Other costs of operations in the Company's Consolidated Statement of Income.
(c)Included in Gain (loss) on bank investment securities in the Company's Consolidated Statement of Income.
Accumulated Other Comprehensive Income (Loss), Net
Accumulated other comprehensive income (loss), net during the three-month periods ended September 30, 2025 and 2024 consisted of the following:
(Dollars in millions)
Investment Securities
Cash Flow HedgesDefined Benefit PlansOther
Total
Balance — July 1, 2025$61 $63 $95 $(4)$215 
Net gain (loss) during period60 5 (2)(1)62 
Balance — September 30, 2025$121 $68 $93 $(5)$277 
Balance — July 1, 2024$(179)$(246)$(118)$(8)$(551)
Net gain (loss) during period230 291 (1)4 524 
Balance — September 30, 2024$51 $45 $(119)$(4)$(27)
Accumulated other comprehensive income (loss), net during the nine-month periods ended September 30, 2025 and 2024 consisted of the following:
(Dollars in millions)
Investment Securities
Cash Flow HedgesDefined Benefit PlansOtherTotal
Balance — January 1, 2025$(153)$(101)$98 $(8)$(164)
Net gain (loss) during period274 169 (5)3 441 
Balance — September 30, 2025$121 $68 $93 $(5)$277 
Balance — January 1, 2024$(187)$(151)$(115)$(6)$(459)
Net gain (loss) during period238 196 (4)2 432 
Balance — September 30, 2024$51 $45 $(119)$(4)$(27)