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Fair value measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Private debt held-for-investment | $ 2,535 | $ 2,628
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 3,360 | 2,731
Short-term debt | 1,499 | 800
Long-term debt | 15,727 | 14,379
Hybrid debt | 421 | 419
Portion at Other than Fair Value Measurement | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Private debt held-for-investment | 0 | 0
Assets, Fair Value Disclosure | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 0 | 0
Short-Term Debt, Fair Value | 0 | 0
Long-term Debt, Fair Value | 0 | 0
Hybrid debt, Fair Value | 0 | 0
Liabilities, Fair Value Disclosure | 0 | 0
Portion at Other than Fair Value Measurement | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Private debt held-for-investment | 0 | 0
Assets, Fair Value Disclosure | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 3,360 | 2,731
Short-Term Debt, Fair Value | 1,492 | 797
Long-term Debt, Fair Value | 14,095 | 12,979
Hybrid debt, Fair Value | 482 | 479
Liabilities, Fair Value Disclosure | 19,429 | 16,986
Portion at Other than Fair Value Measurement | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Private debt held-for-investment | 2,566 | 2,680
Assets, Fair Value Disclosure | 2,566 | 2,680
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 0 | 0
Short-Term Debt, Fair Value | 0 | 0
Long-term Debt, Fair Value | 570 | 0
Hybrid debt, Fair Value | 0 | 0
Liabilities, Fair Value Disclosure | 570 | 0
Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Private debt held-for-investment | 2,566 | 2,680
Assets, Fair Value Disclosure | 2,566 | 2,680
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 3,360 | 2,731
Short-Term Debt, Fair Value | 1,492 | 797
Long-term Debt, Fair Value | 14,665 | 12,979
Hybrid debt, Fair Value | 482 | 479
Liabilities, Fair Value Disclosure | 19,999 | 16,986
Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Private debt held-for-investment | 2,535 | 2,628
Assets, Fair Value Disclosure | 2,535 | 2,628
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 3,360 | 2,731
Short-term debt | 1,499 | 800
Long-term debt | 15,727 | 14,379
Hybrid debt | 421 | 419
Liabilities, Fair Value Disclosure | $ 21,007 | $ 18,329

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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E + Details
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