Short-Term Borrowings - Overnight Maturity (Details) $ in Millions	Dec. 31, 2023 USD ($)
Estimated Fair Value
Short-term Debt [Line Items]
Total	$ 1,719
Term maturity | Estimated Fair Value
Short-term Debt [Line Items]
Total	1,360
Overnight maturity | Estimated Fair Value
Short-term Debt [Line Items]
Total	359
Securities Sold | Reported Amount
Short-term Debt [Line Items]
Total	1,771
Securities Sold | Estimated Fair Value
Short-term Debt [Line Items]
Total	1,720
Securities Sold | Term maturity | Reported Amount
Short-term Debt [Line Items]
Total	1,407
Securities Sold | Overnight maturity | Reported Amount
Short-term Debt [Line Items]
Total	364
Repurchase Agreements | Reported Amount
Short-term Debt [Line Items]
Total	1,867
Repurchase Agreements | Term maturity | Reported Amount
Short-term Debt [Line Items]
Total	1,360
Repurchase Agreements | Overnight maturity | Reported Amount
Short-term Debt [Line Items]
Total	$ 507