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Short-term Borrowings Short-term Borrowings (Summary of Short-term Borrowings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase
Short-term Debt [Line Items]
Amount outstanding at year-end	$ 0	$ 0	$ 71
Weighted average interest rate at year-end	0.00%	0.00%	1.50%
Maximum month-end balance during the year	$ 2	$ 1,513	$ 835
Average balance outstanding during the year	$ 2	$ 30	$ 113
Weighted average interest rate during the year	0.06%	0.97%	2.28%
Other Short-term Borrowings
Short-term Debt [Line Items]
Amount outstanding at year-end	$ 0	$ 0	$ 0
Weighted average interest rate at year-end	0.00%	0.00%	0.00%
Maximum month-end balance during the year	$ 0	$ 1,250	$ 1,200
Average balance outstanding during the year	$ 0	$ 284	$ 256
Weighted average interest rate during the year	0.00%	0.25%	2.44%

X

- Definition

The average effective interest rate during the reporting period.

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