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Short-term Borrowings Short-term Borrowings (Summary of Short-term Borrowings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Amount outstanding at year-end	$ 3,565	$ 3,211
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase
Short-term Debt [Line Items]
Amount outstanding at year-end	$ 15	$ 11	$ 0
Weighted average interest rate at year-end	5.30%	4.32%	0.00%
Maximum month-end balance during the year	$ 19	$ 1,106	$ 2
Average balance outstanding during the year	$ 29	$ 82	$ 2
Weighted average interest rate during the year	4.77%	3.28%	0.06%
Other Short-term Borrowings
Short-term Debt [Line Items]
Amount outstanding at year-end	$ 3,550	$ 3,200	$ 0
Weighted average interest rate at year-end	5.74%	4.54%	0.00%
Maximum month-end balance during the year	$ 11,000	$ 3,200	$ 0
Average balance outstanding during the year	$ 7,189	$ 354	$ 0
Weighted average interest rate during the year	5.41%	4.08%	0.00%

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The average effective interest rate during the reporting period.

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