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Loans and finance receivables - Narrative (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aggregated carrying value | $ 27,082 | $ 26,289
Commercial Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Aggregated carrying value | $ 810 | $ 850
Manufactured and Site-built Home Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of loan balances considered to be current as to payment status | 97.00% |

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- Definition Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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