Investment Securities (Tables)

3 Months Ended

Mar. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of available for sale securities by type

The following is a summary of investment securities as of March 31, 2024 and December 31, 2023:


	2024								2023
Description of Securities (Millions)	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-sale debt securities:
State and municipal obligations	$	60	$	—	$	(7)	$	53	$	61	$	—	$	(6)	$	55
U.S. Government agency obligations	4		—		—		4		4		—		—		4
U.S. Government treasury obligations	1,219		—		(8)		1,211		1,217		1		(12)		1,206
Mortgage-backed securities (a)	12		—		(1)		11		12		—		(1)		11
Foreign government bonds and obligations	815		—		—		815		770		—		—		770
Other (b)	74		—		—		74		74		—		—		74
Equity securities (c)	59		17		(12)		64		60		16		(10)		66
Total	$	2,243	$	17	$	(28)	$	2,232	$	2,198	$	17	$	(29)	$	2,186

(a)Represents mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae.

(b)Represents investments in debt securities issued by Community Development Financial Institutions.

(c)Equity securities comprise investments in common stock, exchange-traded funds and mutual funds.

Available-for-sale securities, continuous unrealized loss position, fair value

The following table provides information about our available-for-sale debt securities with gross unrealized losses and the length of time that individual securities have been in a continuous unrealized loss position as of March 31, 2024 and December 31, 2023:


	2024								2023
	Less than 12 months				12 months or more				Less than 12 months				12 months or more
Description of Securities (Millions)	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
State and municipal obligations	$	—	$	—	$	30	$	(7)	$	—	$	—	$	33	$	(6)
U.S. Government treasury obligations	—		—		1,095		(8)		—		—		1,114		(12)
Mortgage-backed securities	—		—		9		(1)		—		—		7		(1)

Total	$	—	$	—	$	1,134	$	(16)	$	—	$	—	$	1,154	$	(19)

Available for sale securities ratio of fair value to amortized cost

The following table summarizes the gross unrealized losses for available-for-sale debt securities by ratio of fair value to amortized cost as of March 31, 2024 and December 31, 2023:


	Less than 12 months					12 months or more					Total
Ratio of Fair Value to Amortized Cost (Dollars in millions)	Number of Securities	Estimated Fair Value		Gross Unrealized Losses		Number of Securities	Estimated Fair Value		Gross Unrealized Losses		Number of Securities	Estimated Fair Value		Gross Unrealized Losses
2024:
90–100%	—	$	—	$	—	68	$	1,119	$	(10)	68	$	1,119	$	(10)
Less than 90%	—	$	—	$	—	8	$	15	$	(6)	8	$	15	$	(6)
Total as of March 31, 2024	—	$	—	$	—	76	$	1,134	$	(16)	76	$	1,134	$	(16)
2023:
90–100%	—	$	—	$	—	69	$	1,140	$	(14)	69	$	1,140	$	(14)
Less than 90%	—	$	—	$	—	2	$	14	$	(5)	2	$	14	$	(5)
Total as of December 31, 2023	—	$	—	$	—	71	$	1,154	$	(19)	71	$	1,154	$	(19)

Contractual maturities of investment securities

Contractual maturities for available-for-sale debt securities with stated maturities as of March 31, 2024 were as follows:


(Millions)	Cost		Estimated Fair Value
Due within 1 year	$	1,832	$	1,828
Due after 1 year but within 5 years	267		262
Due after 5 years but within 10 years	31		31
Due after 10 years	54		47
Total	$	2,184	$	2,168