Derivatives and Hedging (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Offsetting Derivative Assets [Abstract]
Derivatives, Gross Amounts of Recognized Financial Instruments	$ 20,118,534	$ 15,332,538
Derivatives, Gross Amounts Offset in the Consolidated Statement of Financial Position	(20,019,243)	(15,308,195)
Derivatives, Net Amounts Presented in the Consolidated Statements of Financial Position	99,291	24,343
Derivatives, Financial Instruments/Collateral	0	0
Derivatives, Net Amount	99,291	24,343
Offsetting of Financial Assets, Total Assets
Total Assets, Gross Amounts of Recognized Financial Instruments	20,118,534	15,332,538
Total Assets, Gross Amounts Offset in the Consolidated Statement of Financial Position	(20,019,243)	(15,308,195)
Total Assets, Net Amounts Presented in the Consolidated Statements of Financial Position	99,291	24,343
Total Assets, Financial Instruments/Collateral	0	0
Total Assets, Net Amount	99,291	24,343
Offsetting of Financial Liabilities, Derivatives
Derivatives, Gross Amounts of Recognized Financial Instruments	31,035,004	27,242,182
Derivatives, Gross Amounts Offset in the Consolidated Statement of Financial Position	(29,180,764)	(23,619,586)
Derivatives, Net Amounts Presented in the Consolidated Statements of Financial Position	1,854,240	3,622,596
Derivatives, Financial Instruments/Collateral	(1,854,240)	(3,622,596)
Derivatives, Net Amount	0	0
Offsetting of Financial Liabilities, Total Liabilities
Total Liabilities, Gross Amounts of Recognized Financial Instruments	31,035,004	27,242,182
Total Liabilities, Gross Amounts Offset in the Consolidated Statement of Financial Position	(29,180,764)	(23,619,586)
Total Liabilities, Net Amounts Presented in the Consolidated Statements of Financial Position	1,854,240	3,622,596
Total Liabilities, Financial Instruments/Collateral	(1,854,240)	(3,622,596)
Total Liabilities, Net Amount	$ 0	$ 0