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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

Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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