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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available for Sale Securities by Type
The following is a summary of investment securities as of December 31:
20212020
Description of Securities (Millions)
CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value		CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Available-for-sale debt securities:
State and municipal obligations$106 $5 $— $111 $172 $7 $— $179 
U.S. Government agency obligations6 — — 6 7 — — 7 
U.S. Government treasury obligations1,680 25 (1)1,704 20,655 76 — 20,731 
Mortgage-backed securities (a)
17 1 — 18 28 2 — 30 
Foreign government bonds and obligations630 — — 630 581 — — 581 
Other (b)
43 — — 43 22 — — 22 
Equity securities (c)
66 17 (4)79 56 27 (2)81 
Total$2,548 $48 $(5)$2,591 $21,521 $112 $(2)$21,631 
(a)Represents mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae.
(b)Represents investments in Corporate debt securities and 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 December 31, 2021. There were no available-for-sale debt securities with gross unrealized losses as of December 31, 2020.
2021
Less than 12 months12 months or more
Description of Securities (Millions)
Estimated Fair
Value		Gross Unrealized
Losses		Estimated Fair
Value		Gross Unrealized
Losses
U.S. Government treasury obligations477 (1)— — 
Total$477 $(1)$— $— 
Available for Sale Securities Ratio of Fair Value to Amortized Cost
The following table summarizes the gross unrealized losses by ratio of fair value to amortized cost as of December 31, 2021. There were no available-for-sale debt securities with gross unrealized losses as of December 31, 2020.
Less than 12 months12 months or moreTotal
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
2021:
90%–100%5$477 $(1)—$— $— 5$477 $(1)
Total as of December 31, 20215$477 $(1)—$— $— 5$477 $(1)
Contractual Maturities of Investment Securities
Weighted average yields and contractual maturities for investment securities with stated maturities as of December 31, 2021 were as follows:
(Millions)Due within 1 yearDue after 1 year but within 5 yearsDue after 5 years but within 10 yearsDue after 10 yearsTotal
State and municipal obligations (a)
$6 $5 $30 $70 $111 
U.S. Government agency obligations (a)
— — — 6 6 
U.S. Government treasury obligations832 862 10 — 1,704 
Mortgage-backed securities (a)(b)
— — — 18 18 
Foreign government bonds and obligations628 1 1 — 630 
Other (c)
11 32 — — 43 
Total Estimated Fair Value$1,477 $900 $41 $94 $2,512 
Total Cost$1,476 $879 $35 $92 $2,482 
Weighted average yields (d)
1.74 %2.42 %5.46 %3.10 %2.08 %
(a)The expected payments on state and municipal obligations, U.S. Government agency obligations and mortgage-backed securities may not coincide with their contractual maturities because the issuers have the right to call or prepay certain obligations.
(b)Represents mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac or Ginnie Mae.
(c)Represents investments in corporate debt securities and debt securities issued by Community Development Financial Institutions.
(d)Average yields for investment securities have been calculated using the effective yield on the date of purchase. Yields on tax-exempt investment securities have been computed on a tax-equivalent basis using the U.S. federal statutory tax rate of 21 percent.