Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2019

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
	2019			2018			2017			2019			2018			2017			2019			2018			2017
Balance as of December 31	$	1,102		$	1,082		$	2,842		$	823		$	931		$	1,078		$	—		$	2,000		$	—
Maximum outstanding as of any month-end	4,125			3,441			4,302			931			1,078			1,158			—			2,000			—
Average outstanding during the year	1,616			2,048			3,683			898			1,023			1,127			3			nm			1
Weighted-average interest rate as of year-end	.00		%	1.38		%	.03		%	1.75		%	1.74		%	1.45		%	.00		%	2.68		%	.00		%
Weighted-average interest rate during the year	1.90			.62			.05			1.51			1.46			.79			.01			nm			.00

^nm Not meaningful

The following table presents information about these U.S. government securities and the carrying value of the related repurchase agreements, including accrued interest, as of December 31, 2019.

	U.S. Government Securities Sold				Repurchase Agreements(1)
(In millions)	Amortized Cost		Fair Value		Amortized Cost
Overnight maturity	$	3,891	$	4,112	$	1,102

⁽¹⁾ Collateralized by investment securities.