Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Schedule of Short-term Debt

The following table presents information with respect to the amounts outstanding and weighted-average interest rates of the primary components of our short-term borrowings as of and for the years ended December 31:

(Dollars in millions)	Securities Sold Under Repurchase Agreements									Tax-Exempt Investment Program									Other
	2022			2021			2020			2022			2021			2020			2022			2021			2020
Balance as of December 31	$	1,177		$	1,575		$	3,413		$	—		$	—		$	616		$	2,000		$	—		$	3,302
Maximum outstanding as of any month-end	11,517			1,575			5,373			—			616			823			8,525			—			25,665
Average outstanding during the year	3,633			667			2,615			—			523			771			696			315			8,251
Weighted-average interest rate as of year-end	2.31		%	.00		%	.00		%	—		%	—		%	.23		%	4.18		%	.00		%	1.35		%
Weighted-average interest rate during the year	.39			(.00)			.14			—			.31			.78			.01			—			1.23

The following table presents information about these securities and the carrying value of the related repurchase agreements, including accrued interest, as of December 31, 2022.

	Securities Sold				Repurchase Agreements(1)
(In millions)	Amortized Cost		Fair Value		Amortized Cost
Overnight maturity	$	986	$	963	$	1,173

(1) Collateralized by investment securities.