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Restricted Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Summary of restricted investments by health plan
The following table presents the balances of restricted investments:
 
December 31,
 
2018
 
2017
 
(In millions)
Florida
$
32

 
$
31

New Mexico
43

 
43

Ohio
12

 
12

Puerto Rico
10

 
10

Other
23

 
23

Total Health Plans segment
$
120

 
$
119
Contractual maturities of our held-to-maturity restricted investments
The contractual maturities of our held-to-maturity restricted investments, which are carried at amortized cost, which approximates fair value, as of December 31, 2018 are summarized below.
 
Amortized
Cost
 
Estimated
Fair Value
 
(In millions)
Due in one year or less
$
105

 
$
105

Due after one year through five years
15

 
15

 
$
120

 
$
120