Short-Term Borrowings - Overnight Maturity (Details) $ in Millions	Dec. 31, 2024 USD ($)
Estimated Fair Value
Short-term Debt [Line Items]
Total	$ 4,361
Term maturity | Estimated Fair Value
Short-term Debt [Line Items]
Total	3,500
Overnight maturity | Estimated Fair Value
Short-term Debt [Line Items]
Total	861
Securities Sold | Reported Amount
Short-term Debt [Line Items]
Total	4,463
Securities Sold | Estimated Fair Value
Short-term Debt [Line Items]
Total	4,360
Securities Sold | Term maturity | Reported Amount
Short-term Debt [Line Items]
Total	3,588
Securities Sold | Overnight maturity | Reported Amount
Short-term Debt [Line Items]
Total	875
Repurchase Agreements | Reported Amount
Short-term Debt [Line Items]
Total	3,681
Repurchase Agreements | Term maturity | Reported Amount
Short-term Debt [Line Items]
Total	3,505
Repurchase Agreements | Overnight maturity | Reported Amount
Short-term Debt [Line Items]
Total	$ 176