Derivative Instruments (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivative Assets
Gross Amounts of Recognized Financial Instruments	$ 19,369	$ 14,169
Gross Amounts Offset in the Statements of Financial Position	(18,324)	(13,158)
Net Amounts Presented in the Statements of Financial Position	1,045	1,011
Financial Instruments/Collateral	(290)	(240)
Net Amount	755	771
Securities purchased under agreement to resell
Gross Amounts of Recognized Financial Instruments	1,088	388
Gross Amounts Offset in the Statements of Financial Position	0	0
Net Amounts Presented in the Statements of Financial Position	1,088	388
Financial Instruments/Collateral	(763)	(363)
Net Amount	325	25
Total assets
Gross Amounts of Recognized Financial Instruments	20,457	14,557
Gross Amounts Offset in the Statements of Financial Position	(18,324)	(13,158)
Net Amounts Presented in the Statements of Financial Position	2,133	1,399
Financial Instruments/Collateral	(1,053)	(603)
Net Amount	1,080	796
Derivative Liabilities
Gross Amounts of Recognized Financial Instruments	30,791	27,154
Gross Amounts Offset in the Statements of Financial Position	(26,324)	(22,973)
Net Amounts Presented in the Statements of Financial Position	4,467	4,181
Financial Instruments/Collateral	(3,703)	(3,775)
Net Amount	764	406
Securities sold under agreement to repurchase
Gross Amounts of Recognized Financial Instruments	6,929	6,056
Gross Amounts Offset in the Statements of Financial Position	0	0
Net Amounts Presented in the Statements of Financial Position	6,929	6,056
Financial Instruments/Collateral	(6,633)	(5,811)
Net Amount	296	245
Total liabilities
Gross Amounts of Recognized Financial Instruments	37,720	33,210
Gross Amounts Offset in the Statements of Financial Position	(26,324)	(22,973)
Net Amounts Presented in the Statements of Financial Position	11,396	10,237
Financial Instruments/Collateral	(10,336)	(9,586)
Net Amount	$ 1,060	$ 651