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Short-term Borrowings Short-term Borrowings (Summary of Short-term Borrowings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Amount outstanding at year-end	$ 3,211	$ 0
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase
Short-term Debt [Line Items]
Amount outstanding at year-end	$ 11	$ 0	$ 0
Weighted average interest rate at year-end	4.32%	0.00%	0.00%
Maximum month-end balance during the year	$ 1,106	$ 2	$ 1,513
Average balance outstanding during the year	$ 82	$ 2	$ 30
Weighted average interest rate during the year	3.28%	0.06%	0.97%
Other Short-term Borrowings
Short-term Debt [Line Items]
Amount outstanding at year-end	$ 3,200	$ 0	$ 0
Weighted average interest rate at year-end	4.54%	0.00%	0.00%
Maximum month-end balance during the year	$ 3,200	$ 0	$ 1,250
Average balance outstanding during the year	$ 354	$ 0	$ 284
Weighted average interest rate during the year	4.08%	0.00%	0.25%

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The average effective interest rate during the reporting period.

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