Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2021

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
	2021			2020			2019			2021			2020			2019			2021			2020			2019
Balance as of December 31	$	1,575		$	3,413		$	1,102		$	—		$	616		$	823		$	—		$	3,302		$	—
Maximum outstanding as of any month-end	1,575			5,373			4,125			616			823			931			—			25,665			—
Average outstanding during the year	667			2,615			1,616			523			771			898			315			8,251			3
Weighted-average interest rate as of year-end	.00		%	.00		%	.00		%	.00		%	.23		%	1.75		%	.00		%	1.35		%	.00		%
Weighted-average interest rate during the year	(.00)			.14			1.90			.31			.78			1.51			.00			1.23			.01

The following table presents information about these securities and the carrying value of the related repurchase agreements, including accrued interest, as of December 31, 2021.

	Securities Sold				Repurchase Agreements(1)
(In millions)	Amortized Cost		Fair Value		Amortized Cost
Overnight maturity	$	1,226	$	1,227	$	1,575

(1) Collateralized by investment securities.