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Investments
6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
INVESTMENTS INVESTMENTS
The amortized cost, gross unrealized gains, gross unrealized losses, and fair values of our AFS investments as of June 30, 2021 and December 31, 2020 are presented below:
June 30, 2021December 31, 2020
(in millions)Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueAmortized CostGross Unrealized GainsGross Unrealized LossesFair Value
Asset-backed securities$44 $ $ $44 $24 $— $— $24 
Corporate bonds167 2  169 126 — 128 
U.S. government agencies and government-
sponsored agencies
19   19 27 — 28 
U.S. treasuries312 3  315 261 — 265 
Certificate of deposit10   10 — — — — 
Other debt securities8   8 — — 
Total$560 $5 $ $565 $444 $$— $451 
Gross unrealized losses were immaterial at June 30, 2021 and December 31, 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 decline was deemed to be other-than-temporary. 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)June 30, 2021
One year or less$188 
Over one year through five years340 
Over five years through ten years7 
Over ten years30 
Total fair value$565 
The gross proceeds from sales and maturities of AFS securities for the three and six months ended June 30, 2021 and June 30, 2020 are presented below. We had immaterial gross realized gains and losses from sales of investments for the three and six months ended June 30, 2021 and 2020.
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2021202020212020
Gross proceeds from sales$39 $12 $80 $52 
Gross proceeds from maturities32 40 75 67 
Total$71 $52 $155 $119