Short-Term Debt (Narrative) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Debt Instrument, Collateral Amount	$ 2,000,000,000	$ 1,500,000,000
Line of Credit Facility, Maximum Borrowing Capacity	1,900,000,000	1,600,000,000
Federal Home Loan Bank Stock	34,500
Debt Instrument, Collateral Amount	$ 2,000,000,000	$ 1,500,000,000