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INVESTMENTS
12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
INVESTMENTS INVESTMENTS
The amortized cost, gross unrealized gains, gross unrealized losses, and fair value of our AFS investments as of December 31, 2021 and 2020 are presented below:
December 31, 2021December 31, 2020
(in millions)
Amortized Cost
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Asset-backed securities$49 $ $ $49 $24 $— $— $24 
Corporate bonds167 1 (1)167 126 — 128 
U.S. government agencies and government-sponsored agencies17   17 27 — 28 
U.S. treasuries285 1 (1)285 261 — 265 
Certificate of deposit11   11 — — — — 
Other debt securities9   9 — — 
Total$538 $2 $(2)$538 $444 $$— $451 
Gross unrealized losses were immaterial as of December 31, 2021 and 2020.
Unrealized losses on fixed income securities are principally caused by changes in interest rates and the financial condition of the issuer. In analyzing an issuer's financial condition, we consider whether the securities are issued by the federal government or its agencies, whether downgrades by credit rating agencies have occurred, and industry analysts' reports. As we have the ability to hold these investments until maturity, or for the foreseeable future, no
impairment charges were deemed necessary. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.
The fair value of debt investments by contractual maturity are shown below:
(in millions)December 31, 2021
One year or less$193 
Over one year through five years310 
Over five years through ten years10 
Over ten years25 
Total fair value$538 
The gross proceeds from sales and maturities of AFS securities for the years ended December 31, 2021, 2020, and 2019 are presented below. We had immaterial gross realized gains and losses from sales of investments for the years ended December 31, 2021, 2020, and 2019.
Year Ended December 31,
(in millions)202120202019
Gross proceeds from sales$162 $93 $76 
Gross proceeds from maturities187 131 83 
Total$349 $224 $159