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Significant accounting policies (Tables) | 6 Months Ended
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Jun. 30, 2026
Accounting Policies [Abstract] |
Schedule of Error Corrections and Prior Period Adjustments | Prior period amounts in the Consolidated Statement of Cash Flows have been adjusted to reflect this change in accounting policy as summarized in the following table:
| Six Months Ended June 30, 2025 |  |
(Dollars in millions) | Previously Reported |  | Adjusted |  |  |  |
Net change in interest-bearing deposits at banks | $ | (424) |  |  | $ | — |  |  |  |  |
Net cash from investing activities | (2,985) |  |  | (2,561) |  |  |  |  |
Net change in cash, cash equivalents and restricted cash | 219 |  |  | 643 |  |  |  |  |
Cash, cash equivalents and restricted cash at beginning of period | 1,909 |  |  | 20,782 |  |  |  |  |
Cash, cash equivalents and restricted cash at end of period | 2,128 |  |  | 21,425 |  |  |  |  |

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-8 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 250 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-7 + Details
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