Notes Payable - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Medium term notes called during the period	$ 111,000,000	$ 26,000,000
Maximum borrowing capacity from U.S. Treasury	$ 1,500,000,000
Discount Notes
Debt Instrument [Line Items]
Maturities of notes (in years)	1 year
Medium-term notes | Minimum
Debt Instrument [Line Items]
Maturities of notes (in years)	6 months
Medium-term notes | Maximum
Debt Instrument [Line Items]
Maturities of notes (in years)	25 years
Discount notes
Debt Instrument [Line Items]
Maximum amount of discount notes outstanding at any month end	$ 1,500,000,000	$ 2,200,000,000